The lightcurve file output from extractor did not necessarily include an extension named GTI as required by the standard. Now modified to add such a GTI extension. If there are multiple CCDs and hence gti extensions then individual extensions are still written but a GTI extension is also written containing the merged gtis. v4.72.
Note that this also fixes a bug in xselect when using select intensity on XMM data - the problem was that the new select intensity perl script assumes the presence of an extension called GTI in the lightcurve.
Keywords : HEAsoft, xselect, extractor