Parameters

 Keyword   Posn  Type      Description
 -------   ----  ----      -----------
 INP         1    UNIV      The input container dataset
 DEV         2    CHAR      Destination of text output
     Hidden default = TERMINAL
 EDIT        -    LOGICAL   Whether editing required
     Hidden default = NO
    (The following all have hidden default=! ie no change)
 TARGET      -    CHAR
 OBSERVER    -    CHAR
 OBSERVATORY -    CHAR
 INSTRUMENT  -    CHAR
 AXIS_RA     -    DOUBLE
 AXIS_DEC    -    DOUBLE
 FIELD_RA    -    DOUBLE
 FIELD_DEC   -    DOUBLE
 POSITION_ANGLE   DOUBLE
 EQUINOX     -    INT
 BASE_DATE   -    CHAR
 BASE_MJD    -    INT
 BASE_UTC    -    DOUBLE
 BASE_TAI    -    DOUBLE
 OBS_LENGTH  -    REAL
 EXPOSURE_TIME    REAL