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