set xlabel "time (s)"
set xtics border out nomirror
set ytics border out nomirror
set y2tics border out nomirror
plot "$i" using 1:2 with lines lt 2 axes x1y1 title "raw height",\
"$i" using 1:3 with lines lt 4 axes x1y1 title "kalman height",\
set xlabel "time (s)"
set xtics border out nomirror
set ytics border out nomirror
set y2tics border out nomirror
plot "$i" using 1:2 with lines lt 2 axes x1y1 title "raw height",\
"$i" using 1:3 with lines lt 4 axes x1y1 title "kalman height",\