# set terminal pngcairo  transparent enhanced font "arial,10" fontscale 1.0 size 500, 350 
# set output 'contours.16.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
splot x*y