LIMITS

        [GREG1\]LIMITS [X1  X2  Y1  Y2  [Unit]]  [/XLOG]  [/YLOG]  [/RGDATA]
    [/BLANKING Bval Eval] [/REVERSE [X] [Y]] [/VARIABLES Array_X Array_Y]

    Sets the coordinates of  the plot  region.   The  limits  are  the  user
    coordinates   of   the   BOX   corners,  and  in  conjunction  with  the
    BOX_LOCATION, specifies the conversion formula  between  USER  and  PLOT
    coordinates.  If LIMITS  has  no arguments,  it will  computes automatic
    limits.  The data from  the most recent COLUMN X and Y are  used  to set
    the limits, except if the  /RGDATA  option is present, in which case the
    last read regular grid map is used.
             Some special characters are allowed instead of numerical values
    for the limits :
          *   Compute automatic limit for this argument
          <   Compute automatic limit for this argument, and take
              the minimum of this value and the precedent limit.
          >   Same as above, but take the maximum.
          =   Keep the precedent value for this limit.

    An additional argument can be used when a projection and  a  system  are
    defined. It may take values
      - RADIAN : The values are assumed to be normal  projected  coordinates
        from the projection center.
      - SECOND, MINUTE or  DEGREE  :  The  values  are  converted  from  the
        specified angular unit to radians. They still represent offsets from
        the projection center.
      - ABSOLUTE : The values are assumed to be absolute coordinates on  the
        sphere. APPROXIMATE corresponding projected coordinates are computed
        from  these  values  (the  projected  coordinates  are   necessarily
        approximate  since  in  general  e.g.  the upper left and lower left
        corner of the box correspond to different absolute  Right  ascension
        for Equatorial system).
    The default value is the current angle unit as defined by SET ANGLE.