# set terminal pngcairo  background "#ffffff" enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'surface2.8.png'
set dummy u,v
set key bmargin center horizontal Right noreverse enhanced autotitles nobox
set parametric
set view 50, 30, 1, 1
set isosamples 40, 20
set hidden3d back offset 1 trianglepattern 3 undefined 1 altdiagonal bentover
set style data lines
set ticslevel 0
set title "Parametric Shell (automatic z range)" 
set urange [ 0.00000 : 6.28319 ] noreverse nowriteback
set vrange [ 0.00000 : 6.28319 ] noreverse nowriteback
splot cos(u)*u*(1+cos(v)/2),sin(v)*u/2,sin(u)*u*(1+cos(v)/2)