Histogram of morphological types in the outer region of Virgo (D_M87 > 0.6Mpc). A cutoff of M_r >  −16.5mag and ⟨μ_r⟩_eff,r < 23.0mag/arcsec² was applied to restrict the parameter region to the locus of most of the LSB-components (see Fig. 7), using a distance of 16.5 Mpc for all galaxies. For the red histogram lines, an additional colour cutoff of (g − i) > 0.7 mag was applied. The histogram of the early-type dwarfs (labelled “dE”) also includes the dE(bc)s. Candidate BCDs are included with their respective first-mentioned class (e.g. “Sm/BCD”). The numbers are obtained from the full sample of Virgo cluster galaxies that was used in Weinmann et al. (2011), based on the VCC and adopting a faint magnitude limit of 18 mag in the B-band. For the galaxies that could not be analysed with the SDSS, we use estimations for M_r as described in the appendix of Weinmann et al. (2011), and adopt the average surface brightness and colour of the respective class.