Left panel: shaded histograms represent the number of galaxies in the six spectral types as a function of the absolute V magnitude; the green-dashed line marks the magnitude limit of the subsample used in the analysis (for this plot only, we consider no cut in magnitude). Galaxies brighter than M_V = −22.5 are included in the brightest bin. Right panel: occurrence of morphological types as a function of the spectral class. The percentages refer to the number of objects with a given morphology with respect to each spectroscopic class. For both plots, data have been weighted by both magnitude and geometric completeness. For the right-hand plot only galaxies with M_V < −18 have been considered.