# Gnuplot script to plot data from a file
set terminal pngcairo size 800,600
set output "mag_sphere_plot.png"

set xlabel "Distance North (m)"
set ylabel "Magnetic anomaly (nT)"
set title "Magnetic anomaly of sphere"
set grid

# Use a thin black line for the plot
plot "mag_sphere.dat" using 1:3 with lines linecolor rgb "black" linewidth 1 notitle ,\
     "mag_sphere.dat" using 1:4 with lines linecolor rgb "red" linewidth 1 notitle