# set terminal pngcairo transparent enhanced font "arial,10" fontscale 1.0 size 500, 350 # set output 'contours.17.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 splot [-5:5.01] [-5:5.01] sin(sqrt(x**2+y**2)) / sqrt(x**2+y**2)