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  Include:  FGRAPH.FI, FGRAPH.FD
 
  Type:     INTEGER*2 FUNCTION
 
  Routine:  arc( x1, y1, x2, y2, x3, y3, x4, y4 )
            INTEGER*2 x1, y1, x2, y2, x3, y3, x4, y4
 
            arc_w( wx1, wy1, wx2, wy2, wx3, wy3, wx4, wy4 )
            DOUBLE PRECISION wx1, wy1, wx2, wy2, wx3, wy3, wx4, wy4
 
 
  Returns:  a nonzero value if the arc is drawn successfully, or 0
                if not.
 
  See also: ellipse, getarcinfo, lineto, pie, rectangle, setcolor
                                    -♦-