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f(x)=n + c/(x-l);

set key  off;
set xlabel 'wavelength [nm]';
set ylabel 'n [-]';
set terminal png;

set output 'disperze.png';
fit f(x) 'data.txt' using 1:2 via n,c,l;
plot f(x) with lines, 'data.txt' using 1:2;