Produce the effective area file 'out.arf' (with PSF correction applied) using the spectrum
'sw00599287000xpcw3posr.pha' obtained filtering a Photon Counting mode event file on a spatial
region centered on the source position. Corrections for the effective exposure of the extraction
spatial region is also applied using the information stored in the input sky exposure map 'sw00599287000xpcw3po_ex.img'.
Get all the calibration files needed to perform the computation from the Calibration
> xrtmkarf outfile=out.arf phafile=sw00599287000xpcw3posr.pha expofile=sw00599287000xpcw3po_ex.img
srcx=-1 srcy=-1 psfflag=yes