Evaluation of the performance for emission a) and absorption b): the relative deviation from the SDSS redshift as function of the SDSS redshift (top), the distribution of the MAD of the calculated redshift (middle) and the frequency of the relative deviation (bottom) are shown for the good (left) and the rejected noisy (right) spectral features, respectively. The blue background shade in the upper right figure reflects the objects which are entirely dominated by noise and thus their computed redshift just reflects a random draw of redshifts from the initial distribution, see Eq. (9).