# set terminal canvas  solid butt size 600,400 fsize 10 lw 1 fontscale 1 name "contours_6" jsdir "."
# set output 'contours.6.js'
set view 60, 30, 0.85, 1.1
set samples 20, 20
set isosamples 21, 21
set contour surface
set cntrparam levels auto 10
set title "3D gnuplot demo - contour plot on surface" 
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