#unset autoscale y
#set autoscale ymax
set xlabel "Year"
set ylabel "MB"
set logscale y 10
plot "max-ram
replot "ram
replot "max-disk
set terminal png
set output "disk-vs-ram-big.png"
replot "disk"
set output "disk-vs-ram.png"
set terminal png size 400,300
replot