File:9crossings-2symmetrical.png

Self-made, declared to be in public domain, generated from the following PostScript source code:

%!
306 396 translate 1 setlinejoin/x 5000 sqrt def 12.5 setlinewidth
.92 .96 1 setrgbcolor/A{gsave 29.95 setlinewidth 0 setgray stroke
grestore stroke}def -130.33008589 73.2233047 40.38059223 225 180 arcn
x 100 add neg 150 lineto
-109.61940777 109.61940777 40.38059223 90 315 arcn
x neg -50 100 135 180 arc x 100 add neg -100 50 -90 -45 arc
x 100 add 100 50 135 90 arcn x 50 100 0 -45 arcn
109.61940777 -109.61940777 40.38059223 135 270 arc
x 100 add -150 lineto
130.33008589 -73.2233047 40.38059223 0 45 arc
-52.51262658 109.61940777 40.38059223 45 225 arc 
52.51262658 -109.61940777 40.38059223 45 225 arcn
closepath A 0 setlinejoin 29.95 setlinewidth 0 setgray
-11 -11 moveto 22 22 rlineto stroke
-109.61940777 109.61940777 40.38059223 67 20 arcn stroke
109.61940777 -109.61940777 40.38059223 247 200 arcn stroke
x neg -50 100 142 135 arcn 13 13 rlineto stroke
x 50 100 322 315 arcn -13 -13 rlineto stroke
-52.51262658 109.61940777 40.38059223 197 225 arc 9 -9 rlineto stroke
52.51262658 -109.61940777 40.38059223 17 45 arc -9 9 rlineto stroke
-65.88347648 -48.33008589 moveto 18 -18 rlineto stroke
65.88347648 48.33008589 moveto -18 18 rlineto stroke
12.5 setlinewidth .92 .96 1 setrgbcolor
-12 -12 moveto 24 24 rlineto stroke
-109.61940777 109.61940777 40.38059223 68 19 arcn stroke
109.61940777 -109.61940777 40.38059223 248 199 arcn stroke
x neg -50 100 143 135 arcn 14 14 rlineto stroke
x 50 100 323 315 arcn -14 -14 rlineto stroke
-52.51262658 109.61940777 40.38059223 196 225 arc 10 -10 rlineto stroke
52.51262658 -109.61940777 40.38059223 16 45 arc -10 10 rlineto stroke
-66.88347648 -47.33008589 moveto 20 -20 rlineto stroke
66.88347648 47.33008589 moveto -20 20 rlineto stroke showpage
%EOF