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set terminal png
set key off
set grid
f(x)=a*x**2 + k*x + q
set xlabel "I [A]"
set ylabel "B [mT]"
fit f(x) "mag_pole.txt" using 1:2 via a,k,q
set output "mag_pole.png"
plot "mag_pole.txt" using 1:2 with points, f(x)