set terminal png set output "heston_path.png" set size 1.0,1.0 set multiplot set origin 0.0, 0.3 set size 1.0, 0.7 set title "price development" set xlabel "time in years" set ylabel "spot S" set xrange [0:] set yrange [0:] set data style lines set grid ytics plot "data_heston.txt" every ::0:0::0 notitle set origin 0.0, 0.0 set size 1.0, 0.3 set title "volatility development" set xlabel "time in years" set ylabel "volatility" set xrange [0:] set yrange [0:] set data style lines set grid ytics plot "data_heston.txt" every ::0:1::1 using 1:(sqrt($2)) notitle # pause -1