Fraction of successful and reliable QSOC predictions computed over 439 127 sources contained in the Milliquas 7.2 catalogue with respect to G magnitude (top), Milliquas redshift (middle), and QSOC redshift (bottom). Black line: Fraction of observations with an absolute error of the predicted redshift, |Δz|, lower than 0.1. Orange line: Fraction of flags_qsoc = 0 sources with |Δz|< 0.1. Blue line: Fraction of observations with flags_qsoc = 0. Orange and blue dotted lines correspond to their solid counterpart while considering (flags_qsoc = 0 or flags_qsoc = 16) observations instead of flags_qsoc = 0 observations. Fractions are computed with respect to the number of sources in magnitude and redshift bins of 0.1.