final sum of squares of residuals : 0.0674024
rel. change during last iteration : -2.97991e-012

degrees of freedom    (FIT_NDF)                        : 11
rms of residuals      (FIT_STDFIT) = sqrt(WSSR/ndf)    : 0.0782783
variance of residuals (reduced chisquare) = WSSR/ndf   : 0.00612749

Final set of parameters            Asymptotic Standard Error
=======================            ==========================

m               = -0.721802        +/- 0.02065      (2.861%)
b               = 6.02164          +/- 0.0591       (0.9814%)


correlation matrix of the fit parameters:

               m      b
m               1.000
b              -0.997  1.000
gnuplot> plot "A vs. f.txt" using (log($1)):(log($2)):(log($3)) with yerrorbars title "log(A_v) vs. log(f) curve", f(x) title" y = -
0.721802x + 6.02164"
gnuplot> g(x) = a*(x**b)
gnuplot> a = 1051090
gnuplot> b = -0.721802
gnuplot> fit (f) "A vs. f.txt" using 1:2:3 via a, b
         undefined variable: f

gnuplot> fit g(x) "A vs. f.txt" using 1:2:3 via a, b