f(x)=5*cos(1.5*x)*exp(-x/10) 
g(x)=5*sin(1.5*x)*exp(-x/10) 
set samples 40
unset key
set palette rgbformulae 3,3,0
unset colorbox
set label "{/Helvetica=18 splot with impulses}" at sc 0.4,0.9
set xlabel "Ｘ軸" font "IPAGothic,12"
set ylabel "Ｙ軸" font "IPAMincho,12"
set zlabel "Ｚ軸" font "VLGothic,12"
set xrange [0:10]
set yrange [-5:5]
set zrange [-5:5]
set ticslevel 0
set term pngcairo enh font "Times,10" size 480,360
set out "splot_impulses.png"
splot 0 w pm3d, '+' u 1:(f($1)):(abs(g($1))) w impulses lw 5