Stacked histograms showing dependency of v^Fit on v_loop, for the fit of the single-gaussian function G₁ to synthetic 2-lines EIS spectra. The three plots correspond to a S/N of 10, with (from left to right) intensity ratios I_loop/I_rest of 10%, 20%, and 30%. The blue lines represent the input position of the bright line and the red lines show the empirical relation v^Fit = v_loop × I_loop/I_rest. Black bins corresponds to higher probabilities.