Sérsic index – redshift relation: VIPERS results are presented as red and blue solid lines for spheroid- and disc-like galaxies, respectively, for three values of B-band absolute magnitude. Patel et al. (2013)’s results for quiescent and star-forming objects with log (M/M_⊙) > 10.5 are shown as red filled and empty circles and dashed magenta and blue lines. The relation found by van Dokkum et al. (2010) for a constant co-moving number density sample is plotted in brown (short-dashed line and triangles). Buitrago et al. (2013)’s results for a sample visually classified into early- and late-type galaxies is shown as orange filled and empty diamonds, while disc-galaxies measured by Tamm & Tenjes (2006) are represented by green squares. The dot-dashed lines show n(z) relation corresponding to the disk-like and spheroidal galaxies, only for M_B = −21 mag, obtained from the 2D analysis presented in Sect. 6.