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

%!
306 396 translate 5.2 3 div dup scale 6 setlinewidth 1 setgray
/plr{dup 3 2 roll 72 mul 90 add dup dup/x exch def 3 1 roll cos
mul 3 1 roll sin mul}def/A{0 105 plr moveto 4 105 plr 3 105 plr
2 105 plr 1 105 plr 4{lineto}repeat closepath gsave 12
setlinewidth 0 setgray stroke grestore stroke}def A 36 rotate A
showpage
%EOF