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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)