Existuje trend Správce zdvořilost gnuplot style Monarcha Jahoda vítěz
Gnuplot documentation
Gnuplot - #32 Using gnuplot 4.6, example of linetype and linecolor set termoption dashed set label 1 "set style line 1 lt 2 lc rgb \"red\" lw 3" at -0.4, -0.25, 0