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Table D.1.

Best-fit parameter values of the SYN++ modeling of the spectra of SN 2020xga and SN 2022xgc. The fit parameters are the following: the velocity at the photosphere (vphot [103 km s−1]), the photospheric temperature (Tphot [1000 K]), the optical depth of each ion (log τ [–]), the inner velocity of the line forming region (vmin [103 km s−1]), the outer velocity of the line forming region (vmax [103 km s−1]), the scale hight of the optical depth (aux [103 km s−1]), and the excitation temperature of each ion (Texc [1000 K]).

Ions C II O I O II Na I Si II Ca II Fe II
SN 2020xga (2020.11.07) vphot = 8.0; Tphot = 14.0

log τ -0.4 0.1 -1.2
vmin 8.0 8.0 8.0
vmax 30.0 30.0 30.0
aux 1.0 1.0 1.0
Texc 14.0 14.0 14.0

SN 2022xgc (2022.12.17) vphot = 8.0; Tphot = 13.0

log τ 0.2 3.2 0.1 0.2 -0.1
vmin 8.0 20.0 8.0 8.0 8.0
vmax 30.0 30.0 30.0 30.0 30.0
aux 1.0 1.0 1.0 1.0 1.0
Texc 13.0 13.0 13.0 13.0 13.0

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