Stacked histograms for the fit of the double-gaussian function G₂ to synthetic 2-lines EIS spectra. Left column: dependency of on v_loop, and right column: dependency of on v_loop. Top row: S/N of 10, bottom row: S/N of 126. All spectra used for these plots had an intensity ratio I_loop/I_rest of 30%. The blue lines mark to the input position of the corresponding line (i.e., v_rest or v_loop). Black bins corresponds to higher probabilities.