# set terminal pngcairo transparent enhanced font "arial,10" fontscale 1.0 size 500, 350 # set output 'param.5.png' set dummy t,y set key bmargin center horizontal Right noreverse enhanced autotitles box linetype -1 linewidth 1.000 set parametric set samples 160, 160 set xrange [ -5.00000 : 5.00000 ] noreverse nowriteback set yrange [ -5.00000 : 5.00000 ] noreverse nowriteback plot tan(t),t,t,tan(t)