set style line 100 lw 0.1 lc "black"
set pm3d depth hidden3d ls 100
set cbrange[-0.5:0.5]
set palette rgb -3,-3,-3
unset colorbox
unset border 
unset key
set zrange[-2:2]
unset tics 
set view 60,185,1.5
splot "whale.dat" w pm3d
pause 3
set term pngcairo size 480,480
set out "whale.png"
replot