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Table 1.
Cuts applied to obtain our final spectral sample.
| Criteria | No. of SNe | |
|---|---|---|
| Full ZTF SN Ia DR2 | 3628 | |
| With good LC coverage | 2959 | |
| With basic LC quality cut (a) | 2790 | |
| With redshift cut | z ≤ 0.06 | 1093 |
| With phase cut | −5 d ≤ t0 ≤ 5 d | 546 |
| With non-peculiar SNe Ia | 526 | |
| With spectra quality cut | S/N ≥ 5 | 482 |
Notes.
(a)
Cuts of −4 < x1 < 4, σx1 < 0.6, c < 0.8, σc < 0.35, σt0 < 1 d (see Sect. 2.2).
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