reset set border set xtics 0.5 set ytics 2 set grid set xzeroaxis lt 2 lw 2 set yzeroaxis lt 2 lw 2 set style line 1 lt 3 lw 3 set style line 2 lt 5 lw 3 set style line 3 lt 12 lw 3 set xrange [-5:5] set yrange [-20:20] plot 0 0