how to choose gnuplot font and one gunplot script

set terminal jpeg font "arial" 14

set xrange [0:200000]
plot "ENERGIES-backup" u 1:($4+55.9)*2625.50/4.18 t "Eks vs time" w l
set output "Eksvstime.jpg"
set terminal jpeg font "arial" 14
replot

q1: how to know your default font in your gnuplot program?
In general, gnuplot> help
                    gnuplot>fonts
You will see the default font. In general, it should be Arial.