Keyword Posn Type Description ------- ---- ---- ----------- INP 1 UNIV Any binned or event dataset with a time axis or raw_timetag list - GLOBAL.EVDS ( Default event dataset ) OUT 2 UNIV output dataset SATCORR LOGICAL Correct for the satellite orbit ? (only available on VMS) SIMPLE_MODE LOGICAL One correction applied to the header components of the file. POS_FILE CHARACTER Name of the satellite orbit file GO_ON LOGICAL Ignore invalid Orbit file and perform Earth-centred correction UPDATE_PRD REAL Period after which correction is re-calculated. The default is Dynamic and equal to the orbit file update period UPDATE_INT REAL If there is no orbit file, then a recalculation of the barycentic correction is performed if the time tags change by more than this value. (The MJD changes --- the Earth moves)