Distribution of the B/T ratio with Hubble type (left panel) and stellar mass (right panel). Colour bars represent the mean values of B/T for the observed distributions. Lines with darker colours show the 1σ error. Blue stars show the volume weighted mean values of the B/T ratios with its corresponding 1σ errors. Elliptical galaxies have been excluded from the distribution in the right panel. Bins with less than five galaxies are not represented.