When line segments join at sharp angles "spikes" are
         produced. This test image shows at
         which range they are cut off.
      
   

%!PS BezierMiterJoin.ps
2 2 scale
20 20 translate
/a 10 def
0 20 280 {
	/x exch def
	0 0 moveto
	x 300 lineto
	100 200 200 100 300 0 curveto
	} for
10 setlinewidth
strokepath
0 setlinewidth
stroke showpage