Produce an exposure map in the current directory for the Photon Counting mode event file sw00158855000xpcw2po_cl.evt.
The vignetting correction is applied, the name of the output exposure map, sw00158855000xpc_ex.img, is assigned
according to the standard naming convention and a set of intermediate files is also saved in the current directory.
> xrtexpomap infile=sw00158855000xpcw4po_cl.evt attfile=sw00158855000sat.fits
hdfile=sw00158855000xhdtc.hk nframe=0 vigflag=yes outdir=./ cleanup=no