# set terminal png transparent nocrop enhanced font arial 8 size 420,320 
# set output 'surface1.12.png'
set dummy u,v
set samples 51, 51
set isosamples 21, 21
set title "3D gnuplot demo" 0.000000,0.000000  font ""
set xlabel "X axis" -3.000000,-2.000000  font ""
set xrange [ -1.00000 : 1.00000 ] noreverse nowriteback
set ylabel "Y axis" 3.000000,-2.000000  font ""
set yrange [ -1.00000 : 1.00000 ] noreverse nowriteback
set zlabel "Z axis" -5.000000,0.000000  font ""
splot [x=-3:3] [y=-3:3] sin(x) * cos(y)