Simulated observation of the Fe I spectral line (λ₀ = 6173.3 Å) using a collimated mount and a total of N_λ = 6 wavelengths that have been equally distributed along the spectral line, with the exception of the continuum measurement (light blue), which is selected at 300 mÅ from the blue of the line core. The measured intensity is the result of computing the value given by Eq. (10) at each wavelength and with 𝑔=1.