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GRFAC

       SUBROUTINE  GRFAC (XC,YC, R, THETA1,THETA2, PL2)
 C$    (Arc of Circle)
 C$    Draw a circular arc on the unit square.  The arguments are:
 C$
 C$    (XC,YC)......Coordinates of center of circle.
 C$    R............Radius of circle.
 C$    THETA1.......Starting angle (in degrees) measured
 C$                 counterclockwise  from the X axis.
 C$    THETA2.......Ending angle (in degrees) measured
 C$                 counterclockwise from the X axis.
 C$    PL2..........2-D pen movement routine, normally PL2CA.
 C$    (04-FEB-82)