After happily doing many RMF-less gaussian fits a la Sherpa thread to
HETG emission lines in the standard data products of two observations of
one star separated by a few months, I started to include the standard
CIAO 2.1/CALDB RMF files (that were used, incidentally, to make the garf
files). This worked fine for one observation and fine for the +/-1 MEG
spectra in the second observation but the later +/-1 HEG spectra now
have emission features shifted by +0.5 Angstroms. It looks like +0.500
Angstroms. So the same HEG RMF file seems to work OK for one observation
but not for the second. If I blank out the RMF, the scale goes back to
normal. Anyone know what I'm doing wrong ?
Andy Pollock
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