Table 7: Physical properties of ejecta.
Date April 26 May 15 June 9 Sep. 9 Sep. 16 mean unit
days 144.7 163.7 188.7 281.4 288.5    
$T_{\rm e}$ 10 600 10 700 10 700 10 900 10 600 10 700 $\pm$ 100 K
$N_{\rm e}$ 9.4 8.7 7.8 5.8 5.2   106 cm-3
He I 5876 C/R 0.25 0.26 0.26 0.28 0.25    
$N({\rm He^+})/N({\rm H})$ 0.10 0.09 0.09 0.05 0.05    
$N({\rm He^{++}})/N({\rm H})$ 0.04 0.04 0.07 0.08 0.07    
$N({\rm He})/N({\rm H})$ 0.14 0.13 0.16 0.13 0.12 0.13 $\pm$ 0.01  
m(H) 4.7 4.6 4.7 1.5 1.0 4.7 $\pm$ 1.0 $10^{-5}~M_{\odot}$
m(total) 6.2 6.0 6.3 1.9 1.3 6.2 $\pm$ 1.4 $10^{-5}~M_{\odot}$

The means of m(H) and m(total) are those of April, May and June.

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