# set terminal canvas  solid rounded size 600,400 fsize 10 lw 1.6 fontscale 1 name "contours_6" jsdir "."
# set output 'contours.6.js'
set key at screen 1, 0.9, 0 right top vertical Right noreverse enhanced autotitles nobox
set view 60, 30, 1, 1.1
set samples 20, 20
set isosamples 21, 21
set contour surface
set cntrlabel  format '%8.3g' font ',7' start 5 interval 20
set cntrparam levels auto 10
set style data lines
set title "contours drawn on surface" 
set xlabel "X axis" 
set ylabel "Y axis" 
set zlabel "Z " 
set zlabel  offset character 1, 0, 0 font "" textcolor lt -1 norotate
set fit brief noerrorvariables errorscaling noprescale nowrap
splot x**2-y**2 with lines notitle, x**2-y**2 with lines nosurf lw 3