set xlabel "$x$" set ylabel "$y$" set zlabel "$z$" set xformat r"%s$\pi$"%(x/pi) set key below set size 6 ratio 0.5 zratio 0.5 set grid plot 3d [-10:10][-1:1][-1:1] sin(x):cos(x) with lw 3 \ color hsb($1/20+0.5,0.9,0.8)