$ cat eng.plot
set xrange [-1:1]
set yrange [-1:1]
set style fill solid 0.4 border lc rgb "black"
plot "out.dat" using (0):(0):(1):2:3:($0+1) with circles lc var, \
"in.dat" using (0):(0):(0.75):2:3:($0+2) with circles lc var, \
"" using (0):(0):(0.5):(0):(360) with circles lc rgb "#ffffff"$ cat in.dat
tokyo -60 30
kana 30 90
osaka 90 190
kyoto 190 240
chiba 240 300$ cat out.dat
kanto -120 90
kansai 90 240
さんこう：
http://www.ss.scphys.kyoto-u.ac.jp/person/yonezawa/contents/program/gnuplot/circle-graph.html
http://gnuplot.sourceforge.net/demo_5.0/circles.html
http://soc.if.usp.br/manual/gnuplot-doc/htmldocs/circles.html
