| 
	    plgspa
	  ( | xmin, | 
| xmax, | |
| ymin, | |
| ymax ); | 
      Gets the size of the current subpage in millimeters measured from the
      bottom left hand corner of the output device page or screen.  Can be
      used in conjunction with plsvpa for setting the size of a viewport
      in absolute coordinates (millimeters).
    
xmin
	  (PLFLT_NC_SCALARReturned value of the position of the left hand edge of the subpage in millimeters.
xmax
	  (PLFLT_NC_SCALARReturned value of the position of the right hand edge of the subpage in millimeters.
ymin
	  (PLFLT_NC_SCALARReturned value of the position of the bottom edge of the subpage in millimeters.
ymax
	  (PLFLT_NC_SCALARReturned value of the position of the top edge of the subpage in millimeters.
      Redacted form: plgspa(xmin, xmax, ymin, ymax)
    
This function is used in example 23.