set terminal png size 1024,1024
set output 'p_vs_alt.png'
set xlabel 'Altitude (m)'
set ylabel 'Pressure (mbar)'
set title 'Pressure vs Altitude'
set key off
set autoscale fix
set ytics 25
set grid xtics ytics
set datafile separator ','
plot 'p_vs_alt.csv' with lines