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set terminal png
set samples 20
set key off
set xlabel "x=1/T"
set ylabel "y=ln(Io)-2ln(T)"
set grid
set xtics rotate by -90
#set logscale y
set output "emise_fit.png"
f(x)=a - b*x
fit f(x) "emise_fit.txt" using 2:1 via a, b
plot f(x), "emise_fit.txt" using 2:1
#[0:600][0:0.02]