Fixed a bug that led to systematic overestimation of flux for some sources in
multi-observation extractions. Prior to this release if a source's extraction region
contained no in-band counts (not even background counts) then no extraction was performed for
that observation.
Since the ignored observation's exposure time was not included in the flux calculations
(either in AE or in XSPEC) the source's flux was overestimated.
If you have an existing AE extraction you can identify sources suffering from this problem in several ways:
- The observation directories suffering this problem will contain files named
neighborhood.evt and source.evt but will not contain source.pi.
- If a log of the messages AE produced when /EXTRACT_SPECTRA was run is available this
message indicates that an extraction was aborted:
``EXTRACTION SKIPPED: no in-band data found in source region''.
- The number of observations AE extracted for each source is plotted in the /MERGE_OBSERVATIONS, /PLOT stage. If you have some way of knowing how many observations there should be for each source then you can determine which sources suffer from aborted extractions.