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