Merge individual chips into a single event file
As the CTI correction and some of the other cleaning operations require
that each CCD chip be treated separately, it may be necessary to combine
the individual chip files into a single array event list. This
is easily done with CIAO dmmerge:
Create an ASCII file "mergelist" of chips to be merged:
acisf_evt1.fits.ccd0
acisf_evt1.fits.ccd1
acisf_evt1.fits.ccd2
acisf_evt1.fits.ccd3
Run CIAO dmmerge:
dmmerge
Input: @mergelist
Output: Merge.evts
Note 1: Trouble may occur in merging more than 2 files (core dump), so
this may have to be done repeatedly.
Note 2: Using fmerge rather than dmmerge does not communicate all of
the FITS header keywords, and is not advised.
Note 3: If the input and output data files lie on different computers,
dmmerge, dmcopy and similar programs will run signficantly faster if run
on the machine associated with the output file.