Definitions

• `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).