1 gnuplot -persist << EOF
2 set ylabel "altitude (m)"
5 set xtics border out nomirror
6 set ytics border out nomirror
7 set y2tics border out nomirror
8 plot "$1" using 1:3 with lines axes x1y1 title "raw height",\
9 "$1" using 1:21 with lines axes x1y2 title "error"