ARF and RMF are not automatically associated with individual PHA files for ACIS Continuous Clocking mode datasets.
The ARF and RMF files for ACIS continuous clocking mode observations contain the keyword: CYCLE = 'P'. This keyword is reserved for TIME mode observations, and is not present in the PHA files. This mis-match means that the ARFs and RMFs cannot be automatically matched with the individual PHA files.
unix% tgsplit infile='acisf00689_repro_pha2.fits' arffile='tg/*arf*' rmffile='tg/*rmf*' outroot='tg/acisf00689_repro' ... Created background spectrum: tg/acisf00689_repro_meg_p1_bkg.pha Created background spectrum: tg/acisf00689_repro_meg_p2_bkg.pha Created background spectrum: tg/acisf00689_repro_meg_p3_bkg.pha Cannot find ARF file for MEG -2 Cannot find RMF file for MEG -2 Cannot find ARF file for HEG -1 Cannot find RMF file for HEG -1 Cannot find ARF file for HEG +2 Cannot find RMF file for HEG +2 Cannot find ARF file for MEG +2 ...
Users can work-around the problem by removing the CYCLE keyword from the ARF and RMF files.
unix% dmhedit "tg/*arf,tg/*rmf" file= op=del key=CYCLE