FAQ Entry - ChIPS 4.0

How do I create a contour plot of an image?

Contour plots of FITS images can be created using either make_figure or add_contour:

# Python
  make_figure("img.fits")
  make_figure("img.fits",[1,2,3])
  make_figure("img.fits",[1,2,3],["color","red"])

  add_contour("img.fits")
  add_contour("img.fits",[1,2,3])
  add_contour("img.fits",[1,2,3],["color","red"])

% S-Lang
  make_figure("img.fits");
  make_figure("img.fits",[1,2,3]);
  make_figure("img.fits",[1,2,3],{"color","red"});

  add_contour("img.fits");
  add_contour("img.fits",[1,2,3]);
  add_contour("img.fits",[1,2,3],{"color","red"});

These commands create a contour plot of the image img.fits using: a set of default contour levels calculated from the image, the contour levels 1,2,3, and the contour levels 1,2,3 along with using a red color to draw the contours.