Key points are not available for this paper at this time.
The Asiago Supernova Catalogue and the Nearby Galaxies Catalog are used to study the absolute magnitude distributions of supernovae. SNe Ia that appear to be subluminous are in highly inclined disk galaxies, which implies that the apparent dispersion in SN Ia absolute magnitudes is dominated by interstellar extinction in the parent galaxies, and thus that SNe Ia are good intrinsic standard candles (σ~ -17 for H₀_ =75 km s^-1^ Mpc^-1^) are much more common than intrinsically bright ones.
Miller et al. (Wed,) studied this question.