reset

set encoding iso_8859_1
set title "Widerstandsänderung in Abhängigkeit von B"
set xlabel "[B in T]"
set ylabel "[Widerstandsänderung {/Symbol k}]"
set grid xtics ytics
set key top left

#R_v = 25e3
#U_0 = 6.35
#U_f_0 = 26e-3
#R_f_0 = R_v * U_f_0/(U_0 - U_f_0)

U_0 = 0.8165
I_0 = 20.42e-3
R_0 = U_0 / I_0

f(x) = a*x**2 + b*x + c
fit f(x) 'DatenHallInAsIconst.txt' us ($2):(($4/$1 - R_0) / R_0) via a,b,c

plot \
'DatenHallInAsIconst.txt' us ($2):(($4/$1 - R_0) / R_0) notitle lt 1, \
f(x) title "Ausgleichsparabel" lt 3

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