reset

set title "Hallspannung bei konstantem Magnetfeld B = 1.0 T"
set xlabel "[I_s in mA]"
set ylabel "[U_{H} in mV]"
set grid xtics ytics
set key top left

f(x) = a*x + b
fit f(x) 'DatenHallInAsBconst.txt' us ($1):($2) via a,b

plot \
'DatenHallInAsBconst.txt' us ($1):($2) notitle lt 1, \
f(x) title "Ausgleichsgerade" lt 3

set output "hallinasbconst.eps"
set term postscript enhanced eps color; replot