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748 kaklik 1
f(x)=n + c/(x-l);
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set key  off;
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set xlabel 'wavelength [nm]';
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set ylabel 'n [-]';
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set terminal png;
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924 kaklik 8
c=10
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748 kaklik 10
set output 'disperze.png';
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fit f(x) 'data.txt' using 1:2 via n,c,l;
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plot f(x) with lines, 'data.txt' using 1:2;
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