and discussion {#resdiscus}
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We now study the possible influence of bars and bulges on the SNe distributions through an analysis of the radial distributions of different types of SNe in discs of host galaxies with various morphological types. Here, we widely use our morphological classification, bar detection, and geometry for SNe host galaxies, while for bulge parameters (e.g. bulge-to-disc mass ratio: B/D) we only indirectly consider their statistical relations to the Hubble sequence .

Galactocentric radius deprojection and normalization {#resdiscus_sub1}
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We apply the inclination correction to the projected (observed) galactocentric radii of SNe as described in . The reliability of the inclination correction is based on the fundamental assumption that SNe belong mostly to the disc, rather than the bulge component in S0–Sm galaxies . This assumption is natural for CC SNe, considering the requirement that massive young stars are progenitors located in the discs of host galaxies (e.g. @2008RMxAA..44..103O; ). The spatial distribution of SNe Ia, arising from older WD in binary systems , is more complicated and consists of two interpenetrating components (e.g. @1998ApJ...502..177H): disc and bulge SNe.

If SNe belong mostly to the bulge component, one would expect that the distributions of their projected galactocentric 