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	    plgdiori
	  ( | p_rot ); | 
      Get plot orientation parameter which is multiplied by 90° to
      obtain the angle of rotation.  Note, arbitrary rotation parameters
      such as 0.2 (corresponding to 18°) are possible, but the usual
      values for the rotation parameter are 0., 1., 2., and 3. corresponding
      to 0° (landscape mode), 90° (portrait mode), 180°
      (seascape mode), and 270° (upside-down mode).
      If plsdiori has not been called the default value pointed to by
      p_rot
p_rot
	  (PLFLT_NC_SCALARReturned value of the orientation parameter.
      Redacted form: plgdiori(p_rot)
    
This function is not used in any examples.