# set terminal png transparent nocrop enhanced font arial 8 size 420,320 
# set output 'polar.1.png'
set clip points
unset border
set dummy t,y
set polar
set samples 160, 160
set xzeroaxis lt 0 lw 1.000
set yzeroaxis lt 0 lw 1.000
set xtics axis nomirror norotate autofreq 
set ytics axis nomirror norotate autofreq 
set title "Three circles (with aspect ratio distortion)" 0.000000,0.000000  font ""
set trange [ 0.00000 : 6.28319 ] noreverse nowriteback
plot .5,1,1.5