set ylabel "altitude (m)"
set y2label "velocity (m/s), acceleration(m/s²)"
set xlabel "time (s)"
set ylabel "altitude (m)"
set y2label "velocity (m/s), acceleration(m/s²)"
set xlabel "time (s)"
"$1" using 1:15 with lines axes x1y2 title "accel",\
"$1" using 1:19 with lines axes x1y1 title "drogue",\
"$1" using 1:21 with lines axes x1y1 title "main",\
"$1" using 1:15 with lines axes x1y2 title "accel",\
"$1" using 1:19 with lines axes x1y1 title "drogue",\
"$1" using 1:21 with lines axes x1y1 title "main",\