C*PGVPORT -- non-standard alias for PGSVP
C+
      SUBROUTINE PGVPORT (XLEFT, XRIGHT, YBOT, YTOP)
      REAL XLEFT, XRIGHT, YBOT, YTOP
C
C See description of PGSVP.
C--
      CALL PGSVP (XLEFT, XRIGHT, YBOT, YTOP)
      END