# set terminal pngcairo  transparent enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'lambert.4.png'
set view 75, 281, 1.11607, 1.33952
set isosamples 30, 30
set style data lines
set xyplane at 0
set xtics border in scale 1,0.5 mirror norotate  offset character 0, -0.5, 0 autojustify
set ytics border in scale 3,1.5 mirror norotate  offset character 0, -1, 0 autojustify
set title "LambertW( x+{/:Italic i}y, k )" 
set title  font ",15" textcolor lt -1 norotate
set xrange [ -10.0000 : 10.0000 ] noreverse nowriteback
set x2range [ * : * ] noreverse writeback
set yrange [ -8.00000 : 12.0000 ] noreverse nowriteback
set y2range [ * : * ] noreverse writeback
set zrange [ 0.00000 : * ] noreverse writeback noextend
set cbrange [ * : * ] noreverse writeback
set rrange [ * : * ] noreverse writeback
set pm3d depthorder 
set pm3d interpolate 1,1 flush begin noftriangles border lt black linewidth 0.250 dashtype solid corners2color mean
set colorbox vertical origin screen 0.9, 0.2 size screen 0.05, 0.6 front  noinvert bdefault
unset colorbox
NO_ANIMATION = 1
splot for [k=0:4] abs(LambertW(x+y*{0,1}, k)) with pm3d lc k title sprintf("  k = %d",k) at end