BOX /ABSOLUTE

        The option /ABSOLUTE is used to write (RA,DEC) labels for EQUATORIAL
    system  or  (L,B)  coordinates  for GALACTIC system when a projection is
    active, 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
    /LOCATION 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
    SEXAGESIMAL  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
    spacing with the /ABSOLUTE or the /UNIT options.