Table 3: SYNOW parameters for the Si II fits shown in Fig. 10.
        PVF         HVF    
SN Day $v_{\rm phot}$ $v_{\rm max}$ $\tau$ $T_{\rm exc}$ ve $v_{\rm min}$ $\tau$ $T_{\rm exc}$ ve $T_{\rm bb}$
    103 km s-1 103 km s-1   103 K 103 km s-1 103 km s-1   103 K 103 km s-1 103 K
1990N -14 14.6 21.9 1.15 4 10 21.9 0.72 10 3 11.5
1994D -11 12 20 7 8 3 20 1.2 8 2 12.5
2002bo -11 15 24.5 7.5 10 3 24.5 0.3 10 1 7.5
2002er -12 14 20 7 10 2.4 20 1.1 10 1.8 8
2003du -13 12.8 20 10 10 2 20 2.1 10 1 16
Note. PVF indicates the parametres for the photospheric velocity component.
HVF indicates the parameters for the high-velocity component.

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