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set view equal xy
set zzeroaxis; set xzeroaxis; set yzeroaxis
set xyplane at 0
unset border
unset key
unset xtics
unset ytics
set ztics axis
set arrow 1 from 0,0,0 to 1,0,0 head filled lw 1.5
set label 1 at 1.2,0,0 "X" center
set arrow 2 from 0,0,0 to 0,1,0 head filled lw 1.5
set label 2 at 0,1.2,0 "Y" center
set arrow 3 from 0,0,0 to 0,0,21 head filled lw 1.5
set label 3 at 0,0,23 "Z" center
set view 60, 30, 1., 1.75
set multiplot layout 1,3
set view azimuth 0.
set title 'azimuth 0' offset 0,2
splot sample [t=0:20] '+' using (cos($1)):(sin($1)):($1) with lines lw 2
set title 'azimuth 10' offset 0,2
set view azimuth 10.
replot
set title 'azimuth 60' offset 0,2
set view azimuth 60.
replot
unset multiplot
Click here for minimal script to generate this plot
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