# set terminal pngcairo  transparent enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'contours.2.png'
set key at screen 1, 0.9 right top vertical Right noreverse enhanced autotitle nobox
set style textbox  opaque margins  0.5,  0.5 fc  bgnd noborder linewidth  1.0
set view 60, 30, 0.85, 1.1
set samples 20, 20
set isosamples 21, 21
set contour base
set cntrparam levels 15
set style data lines
set title "more contours (15 levels)" 
set xlabel "X axis" 
set ylabel "Y axis" 
set zlabel "Z " 
set zlabel  offset character 1, 0, 0 font "" textcolor lt -1 norotate
NO_ANIMATION = 1
splot x*y