Comparison of spectroscopic vs. MDN photometric redshifts. The photometric redshifts are taken from the partially supervised ‘spec. class’ IGMM implementation (as described in Sect. 2.2). The colour-scales indicate the number of objects. Top panels: predicted photometric redshifts that correspond to the branches with the highest weights. The single panels show the weights, dispersions (denoted by ‘width’) and residuals from top to bottom. Bottom panels: mean photometric redshifts of the predicted redshifts over all branches with respect to their weights. Lower panel: residuals. Left panels: include all classes with z_spec < 7. Right panels: include all galaxies with z_spec < 0.3.