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INQVN

       SUBROUTINE  INQVN (DX,DY,DZ)
 C$    (Inquire View Plane Normal)
 C$    Return  the  current  value  of  the  View  Plane   Normal,
 C$    (DX,DY,DZ), measured in world  coordinates relative to  the
 C$    View Reference Point.
 C$    (01-APR-82)