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SUBROUTINE PL2CA (X,Y,VISBLE) C$ (2-D Cartesian Pen Movement) C$ Move to the point (X,Y), with visibility determined by C$ VISBLE. The coordinates will normally lie in the unit C$ range 0.0..1.0, as is the case for the contour and C$ hidden-line routines, but any values may be used if the C$ window is set accordingly. C$ (09-APR-82)