# set terminal pngcairo  transparent enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'sampling.9.png'
set style increment default
set hidden3d back offset 1 trianglepattern 3 undefined 1 altdiagonal bentover
set style data lines
set xyplane at 0
set title "3D sampling range distinct from plot x/y range" 
set urange [ 0.00000 : 100.000 ] noreverse nowriteback
set vrange [ 70.0000 : 90.0000 ] noreverse nowriteback
set xrange [ 1.00000 : 100.000 ] noreverse nowriteback
set x2range [ * : * ] noreverse writeback
set yrange [ 1.00000 : 100.000 ] noreverse nowriteback
set y2range [ * : * ] noreverse writeback
set zrange [ * : * ] noreverse writeback
set cbrange [ * : * ] noreverse writeback
set rrange [ * : * ] noreverse writeback
## Last datafile plotted: "++"
splot '++' using 1:2:($1*25.*sin($2/10)),       [u=30:70][v=0:50] '++' using 1:2:(u*v),       [u=40:80][v=30:60] '++' using (u):(v):(u*sqrt(v)) lt 4,       [u=1:100][v=500:1000] '++' using (90):(u):(v) lt 6