5 set ylabel "height (m)"
7 set xtics border out nomirror
8 set ytics border out nomirror
9 set y2tics border out nomirror
10 plot "$i" using 1:2 with lines lt 2 axes x1y1 title "raw height",\
11 "$i" using 1:3 with lines lt 4 axes x1y1 title "kalman height",\
12 "$i" using 1:4 with lines lt 1 axes x1y1 title "max height"