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#set terminal postscript
#set output "struna.ps"
set key off
set xlabel "# harmonics"
set ylabel "frequency"
F=4.91
f(x)=(x+1)*1/2*sqrt(F/Ro)
fit f(x) "struna.txt" via Ro
plot f(x), "struna.txt" using 1:2:3 with errorbars