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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
pause -1 "Hit return to continue"
reset
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