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Table 4

Parameters of the ISM (CIE) plus pure-Si (CIE) or mild-Si models used for the spectral synthesis with the corresponding inferred Si and ejecta masses.

Parameter ISM Pure-metal Mild-ejecta
EM (cm−3) 1.6 × 1059 1.5 × 1055 1.5 × 1057
kT (keV) 0.15 0.8 0.8
Si Abundance 1 300 3

Si mass (M) / 0.015 0.0016
Ejecta mass (M) / 0.06 0.6

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