Left panel: Na i D EW versus the galactic-extinction corrected B−V at +10 d for the CSP-I sample of SE SNe. Arrows indicate upper limits. The best linear fit is shown by a dashed-dotted line. The area in the low-left corner contained within the borders of the square dashed box includes 9 objects (SN 2004aw is not reported because it was not observed at +10 d but its color within +20 d is as blue as that of the other 8 events) whose host extinction is considered to be negligible. Right panel: de-projected and normalized SN offset from the host center versus host galaxy inclination. The objects suspected of suffering low extinction are circled in black, and they never appear in both strongly inclined galaxies and at locations close to their host center (i.e., they always sit outside the box delimited by dashed lines in the figure). Symbols are color coded based on the different sub-types: green, blue, red and magenta for SNe IIb, Ib, Ic and Ic-BL, respectively.
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