# FH HN   kr
set dummy T3
set grid
set key
set nolabel
set noarrow
set nolog
set title "Wirkungsgrad des Carnot-Prozesses" 0,0
set xlabel "(obere) Temperatur T3  / K" 
set ylabel "Wirkungsgrad" 
set yrange [0 : 1]
T1 = 300.
set xrange [T1 : 1700.]
eta(T3) = 1 - T1/T3
set nokey
set label 1 "T1 = 300 K" at 1000,0.5
plot eta(T3)