# set terminal png transparent nocrop enhanced font arial 8 size 420,320 # set output 'contours.13.png' set view 60, 30, 0.85, 1.1 set samples 6, 6 set isosamples 6, 6 set contour base set cntrparam bspline set title "3D gnuplot demo - low resolution (6x6) using bspline approx." 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 [ -1.00000 : 1.00000 ] noreverse nowriteback splot [x=-3:3] [y=-3:3] sin(x) * cos(y)