Comparison of the impact of morphological parameters on the S/N of the extracted Hα-complex lines. The results are presented for four sub-samples of 1248 sources with all morphological parameters set at their default value (see Sect. 2.3.2) but varying one parameter at a time. Namely these parameters are the disk R50 (red), the bulge fraction (blue), the inclination angle (brown), and the position angle (orange). The lines and error bars show the median S/N and MAD values calculated in bins of the corresponding morphological parameters.