The task converts camera-centric positions on the detector, specified either in DETX/Y or RAWX/Y coordinates, into sky (X/Y) coordinates and celestial, RA/DEC positions. RAWX/Y coordinates must be specified together with a CCD number.
The DETX/Y focal-plane coordinates are the same system as the CAMCOORD2 system described in the Calibration Access and Data Handbook, except that the units of DETX/Y are 0.05 arcseconds rather than the millimetres of CAMCOORD2. RAWX/Y coordinates correspond to the PIXCOORD1 system and thus have units of CCD pixels. The position in this system depends on the readout node, which is specifiable via the parameter mosccdnode. (Note that this parameter is ignored if the instrument is PN, since its CCDs only have one readout node.) The default setting mosccdnode=`primary' reflects the fact that nearly all the XMM EPIC MOS data has been taken with that node setting.
The source positions may either be specified one at a time on the command line (ie, 1 source per invocation of edet2sky; datastyle=user) or in bulk via a FITS file (datastyle=set). These two formats are described in more detail below.
