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  Include:  FGRAPH.FI, FGRAPH.FD
 
  Type:     INTEGER*2 FUNCTION
 
  Routine:  lineto( x, y )
            INTEGER*2 x, y
 
            lineto_w( wx, wy )
            DOUBLE PRECISION wx, wy
 
  Returns:  a nonzero value if the line is drawn successfully,
            or 0 if not.
 
  See also: getcurrentposition, moveto, setlinestyle
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