echo "set size ratio -1 4,4" > plot.gp
echo "set terminal png" >> plot.gp
echo "unset key" >> plot.gp

for i in data/*.dat; do
    b=${i%.dat}
    b=${b#data/}
    echo "set output 'image/$b.png'"
    echo "plot [0:10.000000][0:10.000000] 'data/$b.dat' using 1:2:(\$3) :(\$4) with vector"
done >> plot.gp

