reset

set encoding iso_8859_1
set xrange [log(120):log(240)]
set yrange [1:3]
set title "Spannungsabhängigkeit des Drucks"
set xlabel "[ln(U)]"
set ylabel "[ln(v)]"
set grid xtics ytics
set key bottom right

rho = 1.2

f(x) = m*x + c
fit f(x) 'DatenSpannungsabhaengigkeit.txt' us (log($1)):(log(sqrt(2*($2)*9.81/rho))) via m,c

plot 'DatenSpannungsabhaengigkeit.txt' us (log($1)):(log(sqrt(2*($2)*9.81/rho))) title 'Messwerte' lt 1, \
     f(x) title 'Ausgleichsgerade' lt 3

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