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    The  option  /ABSOLUTE  is  used to write (RA,DEC) labels for EQUATORIAL
    system or (L,B) coordinates for GALACTIC system when a projection is ac-
    tive,  i.e.,  both  a  PROJECTION and a SYSTEM are defined. RA (or L) is
    used for X-like axis, and DEC (or B) for Y-like  axis.  Note  that  this
    should  be  used only for small fields (size less than 0.2 Radians), and
    must be used only with the axes at the default position (i.e. no  /LOCA-
    TION  option).  When SYSTEM is defined but the projection is NONE or has
    never been defined, the /ABSOLUTE option supports  large  fields  (since
    PROJECTION NONE makes a non-conformal mapping anyway). The SET SEXAGESI-
    MAL command (see help) permits some mastering on how UNKNOWN or GALACTIC
    ABSOLUTE labels are written.

    See  HELP TICKSPACE for more information on how to master the Tick spac-
    ing with the /ABSOLUTE or the /UNIT options.

Gildas manager 2021-09-24