| 
	    plgdidev
	  ( | p_mar, | 
| p_aspect, | |
| p_jx, | |
| p_jy ); | 
      Get relative margin width, aspect ratio, and relative justification
      that define current device-space window.
      If plsdidev has not been called the default values pointed to by
      p_marp_aspectp_jxp_jy
p_mar
	  (PLFLT_NC_SCALARReturned value of the relative margin width.
p_aspect
	  (PLFLT_NC_SCALARReturned value of the aspect ratio.
p_jx
	  (PLFLT_NC_SCALARReturned value of the relative justification in x.
p_jy
	  (PLFLT_NC_SCALARReturned value of the relative justification in y.
      Redacted form: plgdidev(p_mar, p_aspect, p_jx, p_jy)
    
This function is used in example 31.