# set terminal pngcairo  transparent enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'polargrid.1.png'
set border 4096 front lt black linewidth 1.000 dashtype solid
set dummy t, y
set angles degrees
set tics front
set raxis
set key title "Polar gridded surface" font ":Bold"  center
set key rmargin top vertical Right noreverse enhanced autotitle nobox
set key noinvert samplen 0.5 spacing 1 width 0 height 0
set polar
set polar grid 36, 12 qnorm 1  theta [-20:210]  r [0:*]
set view  equal xyz
set size ratio -1 1,1
set style data lines
unset xtics
unset ytics
set rtics  norangelimit 50 
set ttics axis in scale 1,0.5 nomirror norotate  autojustify
set ttics  norangelimit 0.00000,30 ,330.000
set xrange [ * : * ] noreverse writeback
set x2range [ * : * ] noreverse writeback
set yrange [ * : * ] noreverse writeback
set y2range [ * : * ] noreverse writeback
set zrange [ * : * ] noreverse writeback
set cbrange [ * : * ] noreverse writeback
set rrange [ * : * ] noreverse writeback noextend
set lmargin  5
set rmargin at screen 0.7
set colorbox vertical origin screen 0.9, 0.2 size screen 0.05, 0.6 front  noinvert bdefault
unset colorbox
NO_ANIMATION = 1
## Last datafile plotted: "silver.dat"
plot 'silver.dat' using 1:2:3 with surface title "qnorm 1",      '' using 1:2:3 with points pt 7 lc "green" title "with points"