Last modified: 16 December 2020

Alphabetical List of Ahelp Files


    Topic Context Summary
A absorptionedge models Optical model of an absorption edge.
absorptiongaussian models Gaussian function for modeling absorption (equivalent width).
absorptionlorentz models Lorentz function for modeling absorption (equivalent width).
accretiondisk models A model of emission due to an accretion disk.
add_model modeling Create a user-defined model class.
add_user_pars modeling Add parameter information to a user model.
atten models Model the attenuation by the Inter-Stellar Medium (ISM).

B bbodyfreq models A one-dimensional Blackbody model (frequency).
bbody models A one-dimensional Blackbody model.
beta1d models One-dimensional beta model function.
beta2d models Two-dimensional beta model function.
blackbody models Emission from a black body as a function of wavelength.
box1d models One-dimensional box function.
box2d models Two-dimensional box function.
bpl1d models One-dimensional broken power-law function.
bremsstrahlung models Bremsstrahlung emission.
brokenpowerlaw models Broken power-law model.

C calc_chisqr utilities Calculate the per-bin chi-squared statistic.
calc_data_sum2d utilities Sum up the data values of a 2D data set.
calc_data_sum utilities Sum up the data values over a pass band.
calc_energy_flux utilities Integrate the unconvolved source model over a pass band.
calc_ftest utilities Compare two models using the F test.
calc_kcorr utilities Calculate the K correction for a model.
calc_mlr utilities Compare two models using the Maximum Likelihood Ratio test.
calc_model_sum2d utilities Sum up the convolved model for a 2D data set.
calc_model_sum utilities Sum up the fitted model over a pass band.
calc_photon_flux utilities Integrate the unconvolved source model over a pass band.
calc_source_sum2d utilities Sum up the unconvolved model for a 2D data set.
calc_source_sum utilities Sum up the source model over a pass band.
calc_stat_info fitting Display the statistic values for the current models.
calc_stat utilities Calculate the fit statistic for a data set.
cash statistics A maximum likelihood function.
ccm models Galactic extinction: the Cardelli, Clayton, and Mathis model.
chi2constvar statistics Chi-square statistic with constant variance computed from the counts data.
chi2datavar statistics Chi-square statistic with variance computed from the data.
chi2gehrels statistics Chi-square statistic with the Gehrels variance function.
chi2modvar statistics Chi-square statistic with variance computed from model amplitudes.
chi2xspecvar statistics Chi-square statistic with variance computed from data amplitudes.
chisquare statistics About the chi-square statistic.
clean modeling Clear out the current Sherpa session.
confidence confidence Estimate parameter confidence intervals using the confidence method.
conf confidence Estimate parameter confidence intervals using the confidence method.
const1d models A constant model for one-dimensional data.
const2d models A constant model for two-dimensional data.
contour_data visualization Contour the values of an image data set.
contour_fit_resid visualization Contour the fit and the residuals to a data set.
contour_fit visualization Contour the fit to a data set.
contour_kernel psfs Contour the kernel applied to the model of an image data set.
contour_model visualization Create a contour plot of the model.
contour_psf psfs Contour the PSF applied to the model of an image data set.
contour_ratio visualization Contour the ratio of data to model.
contour_resid visualization Contour the residuals of the fit.
contour_source visualization Create a contour plot of the unconvolved spatial model.
contour visualization Create a contour plot for an image data set.
copy_data data Copy a data set, creating a new identifier.
cos models One-dimensional cosine function.
covariance confidence Estimate parameter confidence intervals using the covariance method.
covar confidence Estimate parameter confidence intervals using the covariance method.
create_arf data Create an ARF.
create_model_component modeling Create a model component.
create_rmf data Create an RMF.
cstat statistics A maximum likelihood function from XSPEC

D dataspace1d data Create the independent axis for a 1D data set.
dataspace2d data Create the independent axis for a 2D data set.
datastack data Sherpa extension package for modeling stacks of data.
delete_bkg_model modeling Delete the background model expression for a data set.
delete_data data Delete a data set by identifier.
delete_model_component modeling Delete a model component.
delete_model modeling Delete the model expression for a data set.
delete_pileup_model model Delete the pile up model for a data set.
delete_psf psfs Delete the PSF model for a data set.
delta1d models One-dimensional delta function.
delta2d models Two-dimensional delta function.
dered models A de-reddening model.
devaucouleurs2d models Two-dimensional de Vaucouleurs model.
disk2d models Two-dimensional uniform disk model.

E edge models Photoabsorption edge model.
emissiongaussian models Gaussian function for modeling emission.
emissionlorentz models Lorentz function for modeling emission.
eqwidth utilities Calculate the equivalent width of an emission or absorption line.
erfc models One-dimensional complementary error function.
erf models One-dimensional error function.
estimate_weighted_expmap contrib Return the estimated exposure map value by weighting an ARF by a spectral model.
exp10 models One-dimensional exponential function, base 10.
exp models One-dimensional exponential function.

F fake_pha data Simulate a PHA data set from a model.
fake data Simulate a data set.
fit_bkg fitting Fit a model to one or more background PHA data sets.
fit fitting Fit a model to one or more data sets.
fm models UV extinction curve: Fitzpatrick and Massa 1988.
freeze modeling Fix model parameters so they are not changed by a fit.

G gamma utilities Calculate the Gamma function.
gauss1d models One-dimensional gaussian function.
gauss2d models Two-dimensional gaussian function.
get_analysis utilities Return the units used when fitting spectral data.
get_areascal data Return the fractional area factor of a PHA data set.
get_arf_plot data Return the data used by plot_arf.
get_arf data Return the ARF associated with a PHA data set.
get_axes data Return information about the independent axes of a data set.
get_backscal data Return the BACKSCAL scaling of a PHA data set.
get_bkg_arf data Return the background ARF associated with a PHA data set.
get_bkg_chisqr_plot data Return the data used by plot_bkg_chisqr.
get_bkg_delchi_plot data Return the data used by plot_bkg_delchi.
get_bkg_fit_plot data Return the data used by plot_bkg_fit.
get_bkg_model_plot data Return the data used by plot_bkg_model.
get_bkg_model data Return the model expression for the background of a PHA data set.
get_bkg_plot data Return the data used by plot_bkg.
get_bkg_ratio_plot data Return the data used by plot_bkg_ratio.
get_bkg_resid_plot data Return the data used by plot_bkg_resid.
get_bkg_rmf data Return the background RMF associated with a PHA data set.
get_bkg_scale data Return the background scaling factor for a background data set.
get_bkg_source_plot data Return the data used by plot_bkg_source.
get_bkg_source data Return the model expression for the background of a PHA data set.
get_bkg data Return the background for a PHA data set.
get_cdf_plot plotting Return the data used to plot the last CDF.
get_chart_spectrum contrib Return the model spectrum in the form required by ChaRT2
get_chisqr_plot statistics Return the data used by plot_chisqr.
get_confidence_results confidence Return the results of the last conf run.
get_conf_opt confidence Return one or all of the options for the confidence interval method.
get_conf_results confidence Return the results of the last conf run.
get_conf confidence Return the confidence-interval estimation object.
get_coord data Get the coordinate system used for image analysis.
get_counts data Return the dependent axis of a data set.
get_covariance_results confidence Return the results of the last covar run.
get_covar_opt confidence Return one or all of the options for the covariance method.
get_covar_results confidence Return the results of the last covar run.
get_covar confidence Return the covariance estimation object.
get_data_contour_prefs data Return the preferences for contour_data.
get_data_contour data Return the data used by contour_data.
get_data_image data Return the data used by image_data.
get_data_plot_prefs data Return the preferences for plot_data.
get_data_plot data Return the data used by plot_data.
get_data_prof_prefs contrib The plot preferences for radial or elliptical profiles of imaging data.
get_data_prof contrib Return the data used to create the radial or elliptical profile of imaging data.
get_data data Return the data set by identifier.
get_default_id info Return the default data set identifier.
get_delchi_plot statistics Return the data used by plot_delchi.
get_delchi_prof_prefs contrib The plot preferences for radial or elliptical profiles of the residuals (data - model)/error to imaging data.
get_delchi_prof contrib Return the data used to create the radial or elliptical profile of the residuals (data - model)/error to imaging data.
get_dep data Return the dependent axis of a data set.
get_dims data Return the dimensions of the data set.
get_draws methods Run the pyBLoCXS MCMC algorithm.
get_energy_flux_hist plotting Return the data displayed by plot_energy_flux.
get_error data Return the errors on the dependent axis of a data set.
get_exposure data Return the exposure time of a PHA data set.
get_filter filtering Return the filter expression for a data set.
get_fit_contour visualization Return the data used by contour_fit.
get_fit_plot plotting Return the data used to create the fit plot.
get_fit_prof contrib Return the data used to create the radial or elliptical profile of fits to imaging data.
get_fit_results fitting Return the results of the last fit.
get_functions info Return the functions provided by Sherpa.
get_grouping data Return the grouping array for a PHA data set.
get_indep data Return the independent axes of a data set.
get_instmap_weights contrib Return the model spectrum in the form required by the spectrumfile parameter of mkinstmap
get_int_proj confidence Return the interval-projection object.
get_int_unc confidence Return the interval-uncertainty object.
get_iter_method_name methods Return the name of the iterative fitting scheme.
get_iter_method_opt methods Return one or all options for the iterative-fitting scheme.
get_kernel_contour visualization Return the data used by contour_kernel.
get_kernel_image visualization Return the data used by image_kernel.
get_kernel_plot plotting Return the data used by plot_kernel.
get_marx_spectrum contrib Return the model spectrum in the form required by MARX
get_method_name methods Return the name of current Sherpa optimization method.
get_method_opt methods Return one or all of the options for the current optimization method.
get_method methods Return an optimization method.
get_model_autoassign_func modeling Return the method used to create model component identifiers.
get_model_component_image modeling Return the data used by image_model_component.
get_model_component_plot modeling Return the data used to create the model-component plot.
get_model_component modeling Returns a model component given its name.
get_model_contour_prefs visualization Return the preferences for contour_model.
get_model_contour visualization Return the data used by contour_model.
get_model_image visualization Return the data used by image_model.
get_model_pars modeling Return the names of the parameters of a model.
get_model_plot_prefs plotting Return the preferences for plot_model.
get_model_plot modeling Return the data used to create the model plot.
get_model_prof_prefs contrib The plot preferences for radial or elliptical profiles of the model (after any PSF convolution) for imaging data.
get_model_prof contrib Return the data used to create the radial or elliptical profile of the source model (after any PSF convolution) for imaging data.
get_model_type modeling Describe a model expression.
get_model modeling Return the model expression for a data set.
get_num_par_frozen modeling Return the number of frozen parameters in a model expression.
get_num_par_thawed modeling Return the number of thawed parameters in a model expression.
get_num_par modeling Return the number of parameters in a model expression.
get_order_plot modeling Return the data used by plot_order.
get_par modeling Return a parameter of a model component.
get_pdf_plot plotting Return the data used to plot the last PDF.
get_photon_flux_hist plotting Return the data displayed by plot_photon_flux.
get_pileup_model modeling Return the pile up model for a data set.
get_prior statistics Return the prior function for a parameter (MCMC).
get_projection_results confidence Return the results of the last proj run.
get_proj_opt confidence Return one or all of the options for the confidence interval method.
get_proj_results confidence Return the results of the last proj run.
get_proj confidence Return the confidence-interval estimation object.
get_psf_contour psfs Return the data used by contour_psf.
get_psf_image psfs Return the data used by image_psf.
get_psf_plot psfs Return the data used by plot_psf.
get_psf psfs Return the PSF model defined for a data set.
get_pvalue_plot plotting Return the data used by plot_pvalue.
get_pvalue_results plotting Return the data calculated by the last plot_pvalue call.
get_quality data Return the quality flags for a PHA data set.
get_rate utilities Return the count rate of a PHA data set.
get_ratio_contour visualization Return the data used by contour_ratio.
get_ratio_image visualization Return the data used by image_ratio.
get_ratio_plot plotting Return the data used by plot_ratio.
get_reg_proj confidence Return the region-projection object.
get_reg_unc confidence Return the region-uncertainty object.
get_resid_contour visualization Return the data used by contour_resid.
get_resid_image visualization Return the data used by image_resid.
get_resid_plot plotting Return the data used by plot_resid.
get_resid_prof_prefs contrib The plot preferences for radial or elliptical profiles of the residuals (data - model) to imaging data.
get_resid_prof contrib Return the data used to create the radial or elliptical profile of the residuals (data - model) to imaging data.
get_response modeling Return the response information applied to a PHA data set.
get_rmf data Return the RMF associated with a PHA data set.
get_sampler_name statistics Return the name of the current MCMC sampler.
get_sampler_opt statistics Return an option of the current MCMC sampler.
get_sampler statistics Return the current MCMC sampler options.
get_scatter_plot plotting Return the data used to plot the last scatter plot.
get_source_component_image modeling Return the data used by image_source_component.
get_source_component_plot modeling Return the data used by plot_source_component.
get_source_contour modeling Return the data used by contour_source.
get_source_image modeling Return the data used by image_source.
get_source_plot modeling Return the data used by plot_source.
get_source_prof_prefs contrib The plot preferences for radial or elliptical profiles of the source model for imaging data.
get_source_prof contrib Return the data used to create the radial or elliptical profile of the source model (before any PSF convolution) for imaging data.
get_source modeling Return the source model expression for a data set.
get_specresp data Return the effective area values for a PHA data set.
get_split_plot plotting Return the plot attributes for displays with multiple plots.
get_staterror data Return the statistical error on the dependent axis of a data set.
get_stat_info fitting Return the statistic values for the current models.
get_stat_name statistics Return the name of the current fit statistic.
get_stat statistics Return the fit statisic.
get_syserror data Return the systematic error on the dependent axis of a data set.
get_trace_plot plotting Return the data used to plot the last trace.
get_xsabund modeling Return the X-Spec abundance setting or elemental abundance.
get_xschatter modeling Return the chatter level used by X-Spec.
get_xscosmo modeling Return the X-Spec cosmology settings.
get_xsxsect modeling Return the cross sections used by X-Spec models.
get_xsxset modeling Return the X-Spec model setting.
gridsearch methods Grid searching optimization method
group_adapt_snr data Adaptively group to a minimum signal-to-noise ratio.
group_adapt data Adaptively group to a minimum number of counts.
group_bins data Group into a fixed number of bins.
group_counts data Group into a minimum number of counts per bin.
group_snr data Group into a minimum signal-to-noise ratio.
group_width data Group into a fixed bin width.
group data Turn on the grouping for a PHA data set.
guess modeling Estimate the parameter values and ranges given the loaded data.

H histogram1d visualization Create a 1D histogram from a sequence of samples.
histogram2d visualization Create 2D histogram from a sequence of samples.
hubblereynolds models Two-dimensional Hubble-Reynolds model.

I igamc utilities Calculate the complement of the regularized incomplete Gamma function (upper).
igam utilities Calculate the regularized incomplete Gamma function (lower).
ignore2d_id filtering Exclude a spatial region from a data set.
ignore2d_image filtering Exclude pixels using the region defined in the image viewer.
ignore2d filtering Exclude a spatial region from all data sets.
ignore_bad filtering Exclude channels marked as bad in a PHA data set.
ignore_id filtering Exclude data from the fit for a data set.
ignore filtering Exclude data from the fit.
image_close visualization Close the image viewer.
image_data visualization Display a data set in the image viewer.
image_deleteframes visualization Delete all the frames open in the image viewer.
image_fit visualization Display the data, model, and residuals for a data set in the image viewer.
image_getregion visualization Return the region defined in the image viewer.
image_kernel psfs Display the 2D kernel for a data set in the image viewer.
image_model_component modeling Display a component of the model in the image viewer.
image_model modeling Display the model for a data set in the image viewer.
image_open visualization Start the image viewer.
image_psf psfs Display the 2D PSF model for a data set in the image viewer.
image_ratio visualization Display the ratio (data/model) for a data set in the image viewer.
image_resid visualization Display the residuals (data - model) for a data set in the image viewer.
image_setregion visualization Set the region to display in the image viewer.
image_source_component modeling Display a component of the source expression in the image viewer.
image_source modeling Display the source expression for a data set in the image viewer.
image_xpaget visualization Return the result of an XPA call to the image viewer.
image_xpaset visualization Return the result of an XPA call to the image viewer.
incbet utilities Calculate the incomplete Beta function.
integrate1d modeling <Integrate1D model type>
integrate modeling Controlling the integration of model components
int_proj confidence Calculate and plot the fit statistic versus fit parameter value.
int_unc confidence Calculate and plot the fit statistic versus fit parameter value.

J jdpileup models A CCD pileup model for the ACIS detectors on Chandra.

L leastsq statistics Chi-square statistic with variance set to 1.
levmar methods Levenberg-Marquardt optimization method
lgam utilities Calculate the log (base e) of the Gamma function.
linebroad models A one-dimensional line-broadening profile.
link modeling Link a parameter to a value.
list_bkg_ids info List all the background identifiers for a data set.
list_data_ids info List the identifiers for the loaded data sets.
list_functions info Display the functions provided by Sherpa.
list_iter_methods methods List the iterative fitting schemes.
list_methods methods List the optimization methods.
list_models models List the available model types.
list_model_components models List the names of all the model components.
list_model_ids info List of all the data sets with a source expression.
list_pileup_model_ids info List of all the data sets with a pile up model.
list_priors statistics Return the priors set for model parameters, if any.
list_psf_ids info List of all the data sets with a PSF.
list_response_ids info List all the response identifiers of a data set.
list_samplers statistics List the MCMC samplers.
list_stats info List the fit statistics.
lmc models LMC extinction: the Howarth model.
load_arf data Load an ARF from a file and add it to a PHA data set.
load_arrays data Create a data set from array values.
load_ascii_with_errors data Load an ASCII file with asymmetric errors as a data set.
load_ascii data Load an ASCII file as a data set.
load_bkg_arf data Load an ARF from a file and add it to the background of a PHA data set.
load_bkg_rmf data Load a RMF from a file and add it to the background of a PHA data set.
load_bkg data Load the background from a file and add it to a PHA data set.
load_conv psfs Load a 1D convolution model.
load_data data Load a data set from a file.
load_filter filtering Load the filter array from a file and add to a data set.
load_grouping data Load the grouping scheme from a file and add to a PHA data set.
load_image data Load an image as a data set.
load_multi_arfs data Load multiple ARFs for a PHA data set.
load_multi_rmfs data Load multiple RMFs for a PHA data set.
load_pha data Load a PHA data set.
load_psf psfs Create a PSF model.
load_quality data Load the quality array from a file and add to a PHA data set.
load_rmf data Load a RMF from a file and add it to a PHA data set.
load_staterror data Load the statistical errors from a file.
load_syserror data Load the systematic errors from a file.
load_table_model modeling Load tabular or image data and use it as a model component.
load_table data Load a FITS binary file as a data set.
load_template_interpolator modeling Set the template interpolation scheme.
load_template_model modeling Load a set of templates and use it as a model component.
load_user_model modeling Create a user-defined model.
load_user_stat statistics Create a user-defined statistic.
load_xstable_model modeling Load a XSPEC table model.
log10 models One-dimensional logarithm function, base 10.
logabsorption models Gaussian function for modeling absorption (log of fwhm).
logemission models Gaussian function for modeling emission (log of fwhm).
logparabola models One-dimensional log-parabolic function.
log models One-dimensional natural logarithm function.
lorentz1d models One-dimensional normalized Lorentz model function.
lorentz2d models Two-dimensional un-normalised Lorentz function.

M models models Summary of Sherpa models (excluding XSPEC).
moncar methods Monte Carlo optimization method
multinormal_pdf utilities The PDF of a multivariate-normal.
multit_pdf utilities The PDF of a multivariate student-t.

N neldermead methods Nelder-Mead Simplex optimization method
normal_sample modeling Sample the fit statistic by taking the parameter values from a normal distribution.
normbeta1d models One-dimensional normalized beta model function.
normgauss1d models One-dimensional normalised gaussian function.
normgauss2d models Two-dimensional normalised gaussian function.
notice2d_id filtering Include a spatial region of a data set.
notice2d_image filtering Include pixels using the region defined in the image viewer.
notice2d filtering Include a spatial region of all data sets.
notice_id filtering Include data from the fit for a data set.
notice filtering Include data in the fit.

O opticalgaussian models Gaussian function for modeling absorption (optical depth).

P pack_image data Convert a data set into an image structure.
pack_pha data Convert a PHA data set into a file structure.
pack_table data Convert a data set into a table structure.
paramprompt modeling Should the user be asked for the parameter values when creating a model?
plot_arf plotting Plot the ARF associated with a data set.
plot_bkg_chisqr plotting Plot the chi-squared value for each point of the background of a PHA data set.
plot_bkg_delchi plotting Plot the ratio of residuals to error for the background of a PHA data set.
plot_bkg_fit_delchi plotting Plot the fit results, and the residuals, for the background of a PHA data set.
plot_bkg_fit_ratio plotting Plot the fit results, and the data/model ratio, for the background of a PHA data set.
plot_bkg_fit_resid plotting Plot the fit results, and the residuals, for the background of a PHA data set.
plot_bkg_fit plotting Plot the fit results (data, model) for the background of a PHA data set.
plot_bkg_model plotting Plot the model for the background of a PHA data set.
plot_bkg_ratio plotting Plot the ratio of data to model values for the background of a PHA data set.
plot_bkg_resid plotting Plot the residual (data-model) values for the background of a PHA data set.
plot_bkg_source plotting Plot the model expression for the background of a PHA data set.
plot_bkg plotting Plot the background values for a PHA data set.
plot_cdf plotting Plot the cumulative density function of an array of values.
plot_chart_spectrum contrib Plot up the model spectrum in the form required by ChaRT
plot_chisqr plotting Plot the chi-squared value for each point in a data set.
plot_data plotting Plot the data values.
plot_delchi plotting Plot the ratio of residuals to error for a data set.
plot_energy_flux plotting Display the energy flux distribution.
plot_fit_delchi plotting Plot the fit results, and the residuals, for a data set.
plot_fit_ratio plotting Plot the fit results, and the ratio of data to model, for a data set.
plot_fit_resid plotting Plot the fit results, and the residuals, for a data set.
plot_fit plotting Plot the fit results (data, model) for a data set.
plot_instmap_weights contrib Plot up the model spectrum in the form required by mkinstmap
plot_kernel psfs Plot the 1D kernel applied to a data set.
plot_marx_spectrum contrib Plot up the model spectrum in the form required by MARX
plot_model_component plotting Plot a component of the model for a data set.
plot_model plotting Plot the model for a data set.
plot_order plotting Plot the model for a data set convolved by the given response.
plot_pdf plotting Plot the probability density function of an array of values.
plot_photon_flux plotting Display the photon flux distribution.
plot_psf psfs Plot the 1D PSF model applied to a data set.
plot_pvalue plotting Compute and plot a histogram of likelihood ratios by simulating data.
plot_ratio plotting Plot the ratio of data to model for a data set.
plot_resid plotting Plot the residuals (data - model) for a data set.
plot_scatter plotting Create a scatter plot.
plot_source_component plotting Plot a component of the source expression for a data set.
plot_source plotting Plot the source expression for a data set.
plot_trace plotting Create a trace plot of row number versus value.
plot plotting Create one or more plot types.
poisson models One-dimensional Poisson function.
polynom1d models One-dimensional polynomial function of order 8.
polynom2d models Two-dimensional polynomial function.
polynomial models Polynomial model of order 5.
powerlaw models Power-law model.
powlaw1d models One-dimensional power-law function.
prof_data contrib Plot a radial or elliptical profile of imaging data.
prof_delchi contrib Plot a radial or elliptical profile of the residuals (data - model)/error to imaging data.
prof_fit_delchi contrib Plot a radial or elliptical profile of the fit (data and model) and residuals (data-model)/error to imaging data.
prof_fit_resid contrib Plot a radial or elliptical profile of the fit (data and model) and residuals (data-model) to imaging data.
prof_fit contrib Plot a radial or elliptical profile of the fit (data and model) to imaging data.
prof_model contrib Plot a radial or elliptical profile of the model (after any PSF convolution) for imaging data.
prof_resid contrib Plot a radial or elliptical profile of the residuals (data - model) to imaging data.
prof_source contrib Plot a radial or elliptical profile of the source model for imaging data.
projection confidence Estimate parameter confidence intervals using the projection method.
proj confidence Estimate parameter confidence intervals using the projection method.
pseudovoigt1d models A weighted sum of a Gaussian and Lorentzian distribution.
pyblocxs methods MCMC-based algorithm for Bayesian Low-Count X-ray Spectral (BLoCXS) analysis

R rebin visualization Rebin a histogram.
recombination models Optically-thin recombination continuum model.
reg_proj confidence Plot the statistic value as two parameters are varied.
reg_unc confidence Plot the statistic value as two parameters are varied.
renorm contrib Change the normalization of a model to match the data.
resample_data data Resample data with asymmetric error bars.
reset modeling Reset the model parameters to their default settings.
restore saving Load in a Sherpa session from a file.

S sample_energy_flux utilities Return the energy flux distribution of a model.
sample_flux utilities Return the flux distribution of a model.
sample_photon_flux utilities Return the photon flux distribution of a model.
save_all saving Save the information about the current session to a text file.
save_arrays saving Write a list of arrays to a file.
save_chart_spectrum contrib Write out the model spectrum in the form required by ChaRT2
save_data saving Save the data to a file.
save_delchi saving Save the ratio of residuals (data-model) to error to a file.
save_error saving Save the errors to a file.
save_filter saving Save the filter array to a file.
save_grouping saving Save the grouping scheme to a file.
save_image saving Save the pixel values of a 2D data set to a file.
save_instmap_weights contrib Write out the model spectrum in the form required by mkinstmap
save_marx_spectrum contrib Write out the model spectrum in the form required by MARX
save_model modeling Save the model values to a file.
save_pha saving Save a PHA data set to a file.
save_quality saving Save the quality array to a file.
save_resid saving Save the residuals (data-model) to a file.
save_source modeling Save the model values to a file.
save_staterror saving Save the statistical errors to a file.
save_syserror saving Save the systematic errors to a file.
save_table saving Save a data set to a file as a table.
save saving Save the current Sherpa session to a file.
scale1d models A constant model for one-dimensional data.
scale2d models A constant model for two-dimensional data.
schechter models One-dimensional Schechter model function.
script saving Save every command typed in a Sherpa session to a file.
seaton models Galactic extinction: the Seaton model from Synphot.
sersic2d models Two-dimensional Sersic model.
set_analysis utilities Set the units used when fitting and displaying spectral data.
set_areascal data Change the fractional area factor of a PHA data set.
set_arf data Set the ARF for use by a PHA data set.
set_backscal data Change the area scaling of a PHA data set.
set_bkg_full_model modeling Define the convolved background model expression for a PHA data set.
set_bkg_model modeling Set the background model expression for a PHA data set.
set_bkg_source modeling Set the background model expression for a PHA data set.
set_bkg data Set the background for a PHA data set.
set_conf_opt confidence Set an option for the confidence interval method.
set_coord data Set the coordinate system to use for image analysis.
set_counts data Set the dependent axis of a data set.
set_covar_opt confidence Set an option for the covariance method.
set_data data Set a data set.
set_default_id utilities Set the default data set identifier.
set_dep data Set the dependent axis of a data set.
set_exposure data Change the exposure time of a PHA data set.
set_filter filtering Set the filter array of a data set.
set_full_model modeling Define the convolved model expression for a data set.
set_grouping data Apply a set of grouping flags to a PHA data set.
set_iter_method_opt methods Set an option for the iterative-fitting scheme.
set_iter_method methods Set the iterative-fitting scheme used in the fit.
set_method_opt methods Set an option for the current optimization method.
set_method methods Set the optimization method.
set_model_autoassign_func modeling Set the method used to create model component identifiers.
set_model modeling Set the source model expression for a data set.
set_par modeling Set the value, limits, or behavior of a model parameter.
set_pileup_model modeling Include a model of the Chandra ACIS pile up when fitting PHA data.
set_prior statistics Set the prior function to use with a parameter.
set_proj_opt confidence Set an option for the projection method.
set_psf psfs Add a PSF model to a data set.
set_quality data Apply a set of quality flags to a PHA data set.
set_rmf data Set the RMF for use by a PHA data set.
set_sampler_opt statistics Set an option for the current MCMC sampler.
set_sampler statistics Set the MCMC sampler.
set_source modeling Set the source model expression for a data set.
set_staterror data Set the statistical errors on the dependent axis of a data set.
set_stat statistics Set the statistical method.
set_syserror data Set the systematic errors on the dependent axis of a data set.
set_xlinear plotting New plots will display a linear X axis.
set_xlog plotting New plots will display a logarithmically-scaled X axis.
set_xsabund modeling Set the elemental abundances used by X-Spec models.
set_xschatter modeling Set the chatter level used by X-Spec.
set_xscosmo modeling Set the cosmological parameters used by X-Spec models.
set_xsxsect modeling Set the cross sections used by X-Spec models.
set_xsxset modeling Set a X-Spec model setting.
set_ylinear plotting New plots will display a linear Y axis.
set_ylog plotting New plots will display a logarithmically-scaled Y axis.
shell2d models A homogenous spherical 3D shell projected onto 2D.
sherparc sherpa The .sherpa.rc file provides user-configuration options for Sherpa
sherpa_chart contrib Create and view spectral files for ChaRT2 (CIAO contributed package).
sherpa_contrib contrib Contributed CIAO routines for Sherpa.
sherpa_marx contrib Create and view spectral files for MARX (CIAO contributed package).
sherpa_profiles contrib Radial profiles of imaging data in Sherpa (CIAO contributed package).
sherpa_utils contrib Utility routines for Sherpa (CIAO contributed package).
sherpa sherpa Introduction to Sherpa, the CIAO modeling and fitting package
show_all info Report the current state of the Sherpa session.
show_bkg_model info Display the background model expression used to fit a data set.
show_bkg_source info Display the background model expression for a data set.
show_bkg info Show the details of the PHA background data sets.
show_conf info Display the results of the last conf evaluation.
show_covar info Display the results of the last covar evaluation.
show_data info Summarize the available data sets.
show_filter filtering Show any filters applied to a data set.
show_fit info Summarize the fit results.
show_kernel psfs Display any kernel applied to a data set.
show_method info Display the current optimization method and options.
show_model info Display the model expression used to fit a data set.
show_proj info Display the results of the last proj evaluation.
show_psf psfs Display any PSF model applied to a data set.
show_source info Display the source model expression for a data set.
show_stat info Display the current fit statistic.
sigmagauss2d models Two-dimensional gaussian function (varying sigma).
simulfit fitting Fit a model to one or more data sets.
sin models One-dimensional sine function.
smc models SMC extinction: the Prevot et al. 1984 model.
sm models Galactic extinction: the Savage & Mathis model.
sqrt models One-dimensional square root function.
stephi1d models One-dimensional step function.
steplo1d models One-dimensional step function.
subtract data Subtract the background estimate from a data set.

T tablemodel models Using an n-dimensional array of values as a model (table model).
tan models One-dimensional tan function.
thaw modeling Allow model parameters to be varied during a fit.
t_sample modeling Sample the fit statistic by taking the parameter values from a Student's t-distribution.

U ungroup data Turn off the grouping for a PHA data set.
uniform_sample modeling Sample the fit statistic by taking the parameter values from an uniform distribution.
unlink modeling Unlink a parameter value.
unpack_arf data Create an ARF data structure.
unpack_arrays data Create a sherpa data object from arrays of data.
unpack_ascii data Unpack an ASCII file into a data structure.
unpack_bkg data Create a PHA data structure for a background data set.
unpack_data data Create a sherpa data object from a file.
unpack_image data Create an image data structure.
unpack_pha data Create a PHA data structure.
unpack_rmf data Create a RMF data structure.
unpack_table data Unpack a FITS binary file into a data structure.
unsubtract data Undo any background subtraction for the data set.

V voigt1d models One dimensional Voigt profile.

W wstat statistics A maximum likelihood function from XSPEC

X xgal models Extragalactic extinction: Calzetti, Kinney and Storchi-Bergmann
xsabsori models The XSPEC absori model: ionized absorber.
xsacisabs models The XSPEC acisabs model: Chandra ACIS q.e. decay.
xsagauss models The XSPEC agauss model: gaussian line profile in wavelength space.
xsagnsed models The XSPEC agnsed model: AGN SED model
xsapec models The XSPEC apec model: APEC emission spectrum.
xsbapec models The XSPEC bapec model: velocity broadened APEC thermal plasma model.
xsbbodyrad models The XSPEC bbodyrad model: blackbody spectrum, area normalized.
xsbbody models The XSPEC bbody model: blackbody spectrum.
xsbexrav models The XSPEC bexrav model: reflected e-folded broken power law, neutral medium.
xsbexriv models The XSPEC bexriv model: reflected e-folded broken power law, ionized medium.
xsbkn2pow models The XSPEC bkn2pow model: broken power law with two breaks.
xsbknpower models The XSPEC bknpower model: broken power law.
xsbmc models The XSPEC bmc model: Comptonization by relativistic matter.
xsbremss models The XSPEC bremss model: thermal bremsstrahlung.
xsbrnei models The XSPEC brnei model: velocity-broadened non-equilibrium recombining collisional plasma.
xsbtapec models The XSPEC btapec model: velocity broadened APEC emission spectrum with separate continuum and line temperatures.
xsbvapec models The XSPEC bvapec model: velocity broadened APEC thermal plasma model.
xsbvrnei models The XSPEC bvrnei model: velocity-broadened non-equilibrium recombining collisional plasma.
xsbvtapec models The XSPEC bvtapec model: velocity broadened APEC emission spectrum with separate continuum and line temperatures.
xsbvvapec models The XSPEC bvvapec model: velocity broadened APEC thermal plasma model.
xsbvvrnei models The XSPEC bvvrnei model: velocity-broadened non-equilibrium recombining collisional plasma.
xsbvvtapec models The XSPEC bvvtapec model: velocity broadened APEC emission spectrum with separate continuum and line temperatures.
xsc6mekl models The XSPEC c6mekl model: differential emission measure using Chebyshev representations with multi-temperature mekal.
xsc6pmekl models The XSPEC c6pmekl model: differential emission measure using Chebyshev representations with multi-temperature mekal.
xsc6pvmkl models The XSPEC c6pvmkl model: differential emission measure using Chebyshev representations with multi-temperature mekal.
xsc6vmekl models The XSPEC c6vmekl model: differential emission measure using Chebyshev representations with multi-temperature mekal.
xscabs models The XSPEC cabs model: Optically-thin Compton scattering.
xscarbatm models The XSPEC carbatm model: Nonmagnetic carbon atmosphere of a neutron star.
xscemekl models The XSPEC cemekl model: plasma emission, multi-temperature using mekal.
xscevmkl models The XSPEC cevmkl model: plasma emission, multi-temperature using mekal.
xscflow models The XSPEC cflow model: cooling flow.
xscflux models The XSPEC cflux convolution model: calculate flux
xsclumin models The XSPEC clumin convolution model: calculate luminosity
xscompbb models The XSPEC compbb model: Comptonization, black body.
xscompls models The XSPEC compLS model: Comptonization, Lamb & Sanford.
xscompmag models The XSPEC compmag model: Thermal and bulk Comptonization for cylindrical accretion onto the polar cap of a magnetized neutron star.
xscompps models The XSPEC compPS model: Comptonization, Poutanen & Svenson.
xscompst models The XSPEC compST model: Comptonization, Sunyaev & Titarchuk.
xscomptb models The XSPEC comptb model: Thermal and bulk Comptonization of a seed blackbody-like spectrum.
xscompth models The XSPEC compth model: Paolo Coppi's hybrid (thermal/non-thermal) hot plasma emission models.
xscomptt models The XSPEC compTT model: Comptonization, Titarchuk.
xsconstant models The XSPEC constant model: energy-independent factor.
xscpflux models The XSPEC cpflux convolution model: calculate photon flux
xscph models The XSPEC cph model: Cooling + heating model for cool core clusters
xscplinear models The XSPEC cplinear model: a non-physical piecewise-linear model for low count background spectra.
xscutoffpl models The XSPEC cutoffpl model: power law, high energy exponential cutoff.
xscyclabs models The XSPEC cyclabs model: absorption line, cyclotron.
xsdiskbb models The XSPEC diskbb model: accretion disk, multi-black body components.
xsdiskir models The XSPEC diskir model: Irradiated inner and outer disk.
xsdiskline models The XSPEC diskline model: accretion disk line emission, relativistic.
xsdiskm models The XSPEC diskm model: accretion disk with gas pressure viscosity.
xsdisko models The XSPEC disko model: accretion disk, inner, radiation pressure viscosity.
xsdiskpbb models The XSPEC diskpbb model: accretion disk, power-law dependence for T(r).
xsdiskpn models The XSPEC diskpn model: accretion disk, black hole, black body.
xsdisk models The XSPEC disk model: accretion disk, black body.
xsdust models The XSPEC dust model: dust scattering.
xsedge models The XSPEC edge model: absorption edge.
xseplogpar models The XSPEC eplogpar model: log-parabolic blazar model with nu-Fnu normalization.
xseqpair models The XSPEC eqpair model: Paolo Coppi's hybrid (thermal/non-thermal) hot plasma emission models.
xseqtherm models The XSPEC eqtherm model: Paolo Coppi's hybrid (thermal/non-thermal) hot plasma emission models.
xsequil models The XSPEC equil model: collisional plasma, ionization equilibrium.
xsexpabs models The XSPEC expabs model: exponential roll-off at low E.
xsexpdec models The XSPEC expdec model: exponential decay.
xsexpfac models The XSPEC expfac model: exponential modification.
xsezdiskbb models The XSPEC ezdiskbb model: multiple blackbody disk model with zero-torque inner boundary.
xsgabs models The XSPEC gabs model: gaussian absorption line.
xsgadem models The XSPEC gadem model: plasma emission, multi-temperature with gaussian distribution of emission measure.
xsgaussian models The XSPEC gaussian model: gaussian line profile.
xsgnei models The XSPEC gnei model: collisional plasma, non-equilibrium, temperature evolution.
xsgrad models The XSPEC grad model: accretion disk, Schwarzschild black hole.
xsgrbcomp models The XSPEC grbcomp model: Comptonization for GRB prompt emission.
xsgrbm models The XSPEC grbm model: gamma-ray burst continuum.
xsgsmooth models The XSPEC gsmooth convolution model: gaussian smoothing
xshatm models The XSPEC hatm model: Nonmagnetic hydrogen atmosphere of a neutron star.
xsheilin models The XSPEC heilin model: Voigt absorption profiles for He I series.
xshighecut models The XSPEC highecut model: high-energy cutoff.
xshrefl models The XSPEC hrefl model: reflection model.
xsireflect models The XSPEC ireflect convolution model: reflection from ionized material
xsismabs models The XSPEC ismabs model: A high resolution ISM absorption model with variable columns for individual ions.
xsjet models The XSPEC jet model: Leptonic relativistic jet model.
xskdblur2 models The XSPEC kdblur2 convolution model: convolve with the laor2 model
xskdblur models The XSPEC kdblur convolution model: convolve with the laor model
xskerrbb models The XSPEC kerrbb model: multi-temperature blackbody model for thin accretion disk around a Kerr black hole.
xskerrconv models The XSPEC kerrconv convolution model: accretion disk line shape with BH spin as free parameter
xskerrdisk models The XSPEC kerrdisk model: accretion disk line emission with BH spin as free parameter.
xskerrd models The XSPEC kerrd model: optically thick accretion disk around a Kerr black hole.
xskyconv models The XSPEC kyconv convolution model: convolution using a relativistic line from axisymmetric accretion disk
xskyrline models The XSPEC kyrline model: relativistic line from axisymmetric accretion disk
xslaor2 models The XSPEC laor2 model: accretion disk with broken-power law emissivity profile, black hole emission line.
xslaor models The XSPEC laor model: accretion disk, black hole emission line.
xslogpar models The XSPEC logpar model: log-parabolic blazar model.
xslorentz models The XSPEC lorentz model: lorentz line profile.
xslsmooth models The XSPEC lsmooth convolution model: lorentzian smoothing
xslyman models The XSPEC lyman model: Voigt absorption profiles for H I or He II Lyman series.
xsmekal models The XSPEC mekal model: emission, hot diffuse gas (Mewe-Kaastra-Liedahl).
xsmeka models The XSPEC meka model: emission, hot diffuse gas (Mewe-Gronenschild).
xsmkcflow models The XSPEC mkcflow model: cooling flow, mekal.
xsnei models The XSPEC nei model: collisional plasma, non-equilibrium, constant temperature.
xsnlapec models The XSPEC nlapec model: continuum-only APEC emission spectrum.
xsnotch models The XSPEC notch model: absorption line, notch.
xsnpshock models The XSPEC npshock model: shocked plasma, plane parallel, separate ion, electron temperatures.
xsnsagrav models The XSPEC nsagrav model: NS H atmosphere model for different g.
xsnsatmos models The XSPEC nsatmos model: NS Hydrogen Atmosphere model with electron conduction and self-irradiation.
xsnsa models The XSPEC nsa model: neutron star atmosphere.
xsnsmaxg models The XSPEC nsmaxg model: neutron star with a magnetic atmosphere.
xsnsmax models The XSPEC nsmax model: Neutron Star Magnetic Atmosphere.
xsnsx models The XSPEC nsx model: neutron star with a non-magnetic atmosphere.
xsnteea models The XSPEC nteea model: non-thermal pair plasma.
xsnthcomp models The XSPEC nthComp model: Thermally comptonized continuum.
xsoptxagnf models The XSPEC optxagnf model: Colour temperature corrected disc and energetically coupled Comptonisation model for AGN.
xsoptxagn models The XSPEC optxagn model: Colour temperature corrected disc and energetically coupled Comptonisation model for AGN.
xspartcov models The XSPEC partcov convolution model: partial covering
xspcfabs models The XSPEC pcfabs model: partial covering fraction absorption.
xspegpwrlw models The XSPEC pegpwrlw model: power law, pegged normalization.
xspexmon models The XSPEC pexmon model: neutral Compton reflection with self-consistent Fe and Ni lines.
xspexrav models The XSPEC pexrav model: reflected powerlaw, neutral medium.
xspexriv models The XSPEC pexriv model: reflected powerlaw, neutral medium.
xsphabs models The XSPEC phabs model: photoelectric absorption.
xsplabs models The XSPEC plabs model: power law absorption.
xsplcabs models The XSPEC plcabs model: powerlaw observed through dense, cold matter.
xsposm models The XSPEC posm model: positronium continuum.
xspowerlaw models The XSPEC powerlaw model: power law photon spectrum.
xspshock models The XSPEC pshock model: plane-parallel shocked plasma, constant temperature.
xspwab models The XSPEC pwab model: power-law distribution of neutral absorbers.
xsqsosed models The XSPEC qsosed model: AGN SED model
xsraymond models The XSPEC raymond model: emission, hot diffuse gas, Raymond-Smith.
xsrdblur models The XSPEC rdblur convolution model: convolve with the diskline model shape
xsredden models The XSPEC redden model: interstellar extinction.
xsredge models The XSPEC redge model: emission, recombination edge.
xsreflect models The XSPEC reflect convolution model: reflection from neutral material
xsrefsch models The XSPEC refsch model: reflected power law from ionized accretion disk.
xsrfxconv models The XSPEC rfxconv convolution model: angle-dependent reflection from an ionized disk
xsrgsxsrc models The XSPEC rgsxsrc convolution model: convolve an RGS spectrum for extended emission.
xsrnei models The XSPEC rnei model: non-equilibrium recombining collisional plasma.
xssedov models The XSPEC sedov model: sedov model, separate ion/electron temperature.
xssimpl models The XSPEC simpl convolution model: comptonization of a seed spectrum.
xssirf models The XSPEC sirf model: self-irradiated funnel.
xsslimbh models The XSPEC slimbh model: Stationary slim accretion disk.
xssmedge models The XSPEC smedge model: smeared edge.
xssnapec models The XSPEC snapec model: galaxy cluster spectrum using SN yields.
xsspexpcut models The XSPEC spexpcut model: super-exponential cutoff absorption.
xsspline models The XSPEC spline model: spline modification.
xssrcut models The XSPEC srcut model: synchrotron spectrum, cutoff power law.
xssresc models The XSPEC sresc model: synchrotron spectrum, cut off by particle escape.
xsssa models The XSPEC ssa model: Strangeon star atmosphere.
xssss_ice models The XSPEC sss_ice model: Einstein SSS ice absorption.
xsstep models The XSPEC step model: step function convolved with gaussian.
xsswind1 models The XSPEC swind1 model: absorption by partially ionized material with large velocity shear.
xstapec models The XSPEC tapec model: APEC emission spectrum with separate continuum and line temperatures.
xstbabs models The XSPEC TBabs model: ISM grain absorption.
xstbfeo models The XSPEC TBfeo model: ISM grain absorption.
xstbgas models The XSPEC TBgas model: ISM grain absorption.
xstbgrain models The XSPEC TBgrain model: ISM grain absorption.
xstbpcf models The XSPEC TBpcf model: ISM grain absorption.
xstbrel models The XSPEC TBrel model: ISM grain absorption.
xstbvarabs models The XSPEC TBvarabs model: ISM grain absorption.
xsuvred models The XSPEC uvred model: interstellar extinction, Seaton Law.
xsvapec models The XSPEC vapec model: APEC emission spectrum.
xsvarabs models The XSPEC varabs model: photoelectric absorption.
xsvashift models The XSPEC vashift convolution model: velocity shift an additive model.
xsvbremss models The XSPEC vbremss model: thermal bremsstrahlung.
xsvcph models The XSPEC vcph model: Cooling + heating model for cool core clusters
xsvequil models The XSPEC vequil model: collisional plasma, ionization equilibrium.
xsvgadem models The XSPEC vgadem model: plasma emission, multi-temperature with gaussian distribution of emission measure.
xsvgnei models The XSPEC vgnei model: collisional plasma, non-equilibrium, temperature evolution.
xsvmcflow models The XSPEC vmcflow model: cooling flow, mekal.
xsvmekal models The XSPEC vmekal model: emission, hot diffuse gas (Mewe-Kaastra-Liedahl).
xsvmeka models The XSPEC vmeka model: emission, hot diffuse gas (Mewe-Gronenschild).
xsvmshift models The XSPEC vmshift convolution model: velocity shift a multiplicative model.
xsvnei models The XSPEC vnei model: collisional plasma, non-equilibrium, constant temperature.
xsvnpshock models The XSPEC vnpshock model: shocked plasma, plane parallel, separate ion, electron temperatures.
xsvoigt models The XSPEC voigt model: Voigt line profile.
xsvphabs models The XSPEC vphabs model: photoelectric absorption.
xsvpshock models The XSPEC vpshock model: plane-parallel shocked plasma, constant temperature.
xsvraymond models The XSPEC vraymond model: emission, hot diffuse gas, Raymond-Smith.
xsvrnei models The XSPEC vrnei model: non-equilibrium recombining collisional plasma.
xsvsedov models The XSPEC vsedov model: sedov model, separate ion/electron temperature.
xsvtapec models The XSPEC vtapec model: APEC emission spectrum with separate continuum and line temperatures.
xsvvapec models The XSPEC vvapec model: APEC emission spectrum.
xsvvgnei models The XSPEC vvgnei model: collisional plasma, non-equilibrium, temperature evolution.
xsvvnei models The XSPEC vvnei model: collisional plasma, non-equilibrium, constant temperature.
xsvvnpshock models The XSPEC vvnpshock model: shocked plasma, plane parallel, separate ion, electron temperatures.
xsvvpshock models The XSPEC vvpshock model: plane-parallel shocked plasma, constant temperature.
xsvvrnei models The XSPEC vvrnei model: non-equilibrium recombining collisional plasma.
xsvvsedov models The XSPEC vvsedov model: sedov model, separate ion/electron temperature.
xsvvtapec models The XSPEC vvtapec model: APEC emission spectrum with separate continuum and line temperatures.
xswabs models The XSPEC wabs model: photoelectric absorption, Wisconsin cross-sections.
xswndabs models The XSPEC wndabs model: photo-electric absorption, warm absorber.
xsxilconv models The XSPEC xilconv convolution model: angle-dependent reflection from an ionized disk
xsxion models The XSPEC xion model: reflected spectrum of photo-ionized accretion disk/ring.
xsxscat models The XSPEC xscat model: dust scattering.
xszagauss models The XSPEC zagauss model: gaussian line profile in wavelength space.
xszashift models The XSPEC zashift convolution model: redshift an additive model.
xszbabs models The XSPEC zbabs model: EUV ISM attenuation.
xszbbody models The XSPEC zbbody model: blackbody spectrum.
xszbknpower models The XSPEC zbknpower model: broken power law.
xszbremss models The XSPEC zbremss model: thermal bremsstrahlung.
xszcutoffpl models The XSPEC zcutoffpl model: power law, high energy exponential cutoff.
xszdust models The XSPEC zdust model: extinction by dust grains.
xszedge models The XSPEC zedge model: absorption edge.
xszgauss models The XSPEC zgauss model: gaussian line profile.
xszhighect models The XSPEC zhighect model: high-energy cutoff.
xszigm models The XSPEC zigm model: UV/Optical attenuation by the intergalactic medium.
xszlogpar models The XSPEC zlogpar model: log-parabolic blazar model.
xszmshift models The XSPEC zmshift convolution model: redshift a multiplicative model.
xszpcfabs models The XSPEC zpcfabs model: partial covering fraction absorption.
xszphabs models The XSPEC zphabs model: photoelectric absorption.
xszpowerlw models The XSPEC zpowerlw model: redshifted power law photon spectrum.
xszredden models The XSPEC zredden model: redshifted version of redden.
xszsmdust models The XSPEC zsmdust model: extinction by dust grains in starburst galaxies.
xsztbabs models The XSPEC zTBabs model: ISM grain absorption.
xszvarabs models The XSPEC zvarabs model: photoelectric absorption.
xszvfeabs models The XSPEC zvfeabs model: photoelectric absorption with free Fe edge energy.
xszvphabs models The XSPEC zvphabs model: photoelectric absorption.
xszwabs models The XSPEC zwabs model: photoelectric absorption, Wisconsin cross-sections.
xszwndabs models The XSPEC zwndabs model: photo-electric absorption, warm absorber.
xszxipcf models The XSPEC zxipcf model: partial covering absorption by partially ionized material.
xs models XSPEC model functions.