# set terminal pngcairo  background "#ffffff" enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'surface2.6.png'
set dummy u,v
set key bmargin center horizontal Right noreverse enhanced autotitles nobox
set parametric
set view 45, 50, 1, 1
set isosamples 100, 20
set hidden3d back offset 1 trianglepattern 3 undefined 1 altdiagonal bentover
set style data lines
set ticslevel 0
set title "Parametric Helix" 
set urange [ 0.00000 : 31.4159 ] noreverse nowriteback
set vrange [ 0.00000 : 6.28319 ] noreverse nowriteback
splot (1-0.1*cos(v))*cos(u),(1-0.1*cos(v))*sin(u),0.1*(sin(v)+u/1.7-10)