set term pngc enh font "Times,6" size 560,420 
set out 'japan.png'

unset key
set tics tc rgb "dark-red"
set xr [125:150]
set yr [29:49]
set xlabel "longitude" font ",10" off 0,0.5 tc rgb "dark-red"
set ylabel "north latitude" font ",10"  tc rgb "dark-red"
set object rectangle from 125,29 to 150,49 fc rgb "navy"
set size ratio -1
set multiplot lay 2,2
plot 'world.dat' w filledc  lc rgb "gold"
plot 'world_110m.txt' w filledc lc rgb "gold"
plot 'world_50m.txt' w filledc  lc rgb "gold"
plot 'world_10m.txt' w filledc  lc rgb "gold"
unset multiplot

!display japan.png