For the sake of brevity, the following terms will be used in this document:
`EQPOS' refers to equatorial coordinates [ ra, dec ].
`DET' coordinates refers to the CAMCOORD2 system,
but expressed in units of 0.05 arcsec instead of mm,
as these are the units in
which the detector coordinates are presented
in the event list after pipeline
processing (ie columns DETX and DETY;
see [5]).
`POS' coordinates refers to the projected sky coordinates
of the source relative to the nominal pointing position,
in units of 0.05 arcsec.
This is the system in
which the sky coordinates of an event are presented
in the event list after pipeline
processing (ie columns X and Y;
see [5]).
`TEL' refers to telescope coordinates (theta, phi).
