AD tests for the other subsamples do not change the results of Table \[SNeindisc\].

Performing simple calculations, we find that the ratio of the mean values of $|V|$ and $|U|$ is 0.71 for Type Ia and 0.75 for CC SNe in face-on, and, respectively, 0.35 and 0.36 in edge-on galaxies. These numbers are very close to the mean values of the cosines of the inclinations ($\langle \cos \,\, i\rangle =0.74\pm0.01$ in face-on galaxies and $0.31\pm0.02$ in edge-on galaxies – where the uncertainties are the errors on the means), thus supporting the fact that the vast majority of SNe in S0–Sm galaxies are distributed within the stellar discs. Similar results are found when only considering Sa–Sm galaxies. This also suggests that the rate of SNe Ia in spiral galaxies is dominated by a relatively young/intermediate progenitor population .

For deprojected host discs, in Fig. \[hist\_coord\] we also show (in black) the $V/r_{25}$ versus $U/R_{25}$ distributions and their histograms for different samples, where $r_{25}$ is the $g$-band 25th magnitude isophotal semiminor axis ($r_{25}=R_{25} \, \cos \,\, i$). In contrast to the previous normalization, the KS and AD tests show that the distributions of $U/R_{25}$ and $V/r_{25}$ both for Type Ia and CC 