Fit of the profile of the forbidden oxygen lines. The abscissa is the wavelength in nm. The blue lines show the synthetic spectra computed with A(O) = 8.1 and A(O) = 8.7. The red line is the best fit obtained with A(O) = 8.3 for the line at 630 nm, and A(O) = 8.55 for the spectrum line at 636.3 nm.
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