reset

set title "Hallwiderstand bei konstantem Strom I_s = 20.5 mA"
set xlabel "[B in T]"
set ylabel "[R in {/Symbol W}]"
#set yrange [2:2.4]
set grid xtics ytics
set key top left

f(x) = a*x**2 + b*x + c
fit f(x) 'DatenHallInAsIconst.txt' us ($2):($4)/($1) via a,b,c

plot \
'DatenHallInAsIconst.txt' us ($2):($4)/($1) notitle lt 1, \
f(x) title "Ausgleichsparabel" lt 3

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