reset set angles degrees set polar set grid polar 30 lc rgbcolor "#999999" unset border unset param set size ratio 1 1,1 set xtics axis nomirror -50,10 unset ytics unset key set style data line set xrange[-50:50] set yrange[-50:50] set rrange[-50:0] set label 1 "0°" at graph 1.01,0.5 front set label 2 "180°" at graph -0.01,0.5 right front set label 3 "-90°" at graph 0.5,-0.03 center front set label 4 "90°" at graph 0.5,1.03 center front plot 'beamPattern.dat' u 2:5