# set terminal png transparent nocrop enhanced font arial 8 size 420,320 # set output 'contours.18.png' set view 60, 30, 0.85, 1.1 set samples 25, 25 set isosamples 26, 26 set contour base set cntrparam bspline set title "3D gnuplot demo - contour of Sinc function" set xlabel "X axis" set ylabel "Y axis" set zlabel "Z axis" set zlabel offset character 1, 0, 0 font "" textcolor lt -1 norotate set zrange [ * : * ] noreverse nowriteback # (currently [-1.00000:1.00000] ) splot [-12:12.01] [-12:12.01] sin(sqrt(x**2+y**2)) / sqrt(x**2+y**2)