Self-made graphic, converted from a version of the following PostScript vector source code:

%!
306 396 translate 2.4 dup scale/plr{.25 sub 2.47213472 12.5 mul mul
dup 3 2 roll 72 mul 90 add dup 3 1 roll cos mul 3 1 roll sin mul}
def/P{/x exch def 4 x plr 3 x plr 2 x plr 1 x plr 0 x plr moveto
4{lineto}repeat closepath stk}def/xyadd{3 2 roll add 3 1 roll add
exch}def/h{42.5325}def/ang{exch 72 mul add dup sin h mul exch cos
h mul}def/stk{gsave 50 3 div setlinewidth 0 setgray stroke grestore
stroke}def 1 setgray 50 6 div setlinewidth 3 P
0 3 plr 0 90 ang xyadd moveto 0 2 plr lineto stk
0 3 plr 0 90 ang neg exch neg exch xyadd moveto 0 2 plr lineto stk
1 3 plr 1 126 ang xyadd moveto 1 2 plr lineto stk
1 3 plr 1 126 ang neg exch neg exch xyadd moveto 1 2 plr lineto stk
2 3 plr 2 162 ang xyadd moveto 2 2 plr lineto stk
2 3 plr 2 162 ang neg exch neg exch xyadd moveto 2 2 plr lineto stk
3 3 plr 3 198 ang xyadd moveto 3 2 plr lineto stk
3 3 plr 3 198 ang neg exch neg exch xyadd moveto 3 2 plr lineto stk
4 3 plr 4 234 ang xyadd moveto 4 2 plr lineto stk
4 3 plr 4 234 ang neg exch neg exch xyadd moveto 4 2 plr lineto stk
2 P showpage
%EOF