set terminal postscript color
set xlabel "x"

set output "functions.eps"
set title "Derivative of sinus function"
set ylabel "sin(x)"
plot "daten.txt" u 1:2 t "cos(x)" w lp, "daten.txt" u 1:3 t "approximation" w lp

set output "error.eps"
set title "Truncation error"
set ylabel "e(x)"
plot "daten.txt" u 1:4 t "Difference" w lp