# set terminal pngcairo transparent enhanced font "arial,10" fontscale 1.0 size 500, 350 # set output 'contours.7.png' set view 60, 30, 0.85, 1.1 set samples 20, 20 set isosamples 21, 21 set contour both set cntrparam levels auto 10 set title "3D gnuplot demo - contour plot on both" 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 x**2-y**2