deflagration model W7 (see also Thielemann et al. 2004).

Results
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Characteristic Burning Regimes
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Before presenting the result of our calculations, we summarize the basics of explosive burning taking place in the deflagration and detonation stages. Typical burning products can be characterized by the maximum temperatures ($T_{\rm max}$) and densities ($\rho_{\rm max}$) attained by the material under consideration, after the passage of the thermonuclear flame \[see, e.g., Arnett (1996), Thielemann et al. (1998), and references therein, for a review of explosive nucleosynthesis\].

The explosive burning in thermonuclear supernovae proceeds in different regimes, mainly characterized by the temperatures reached in the nuclear ashes (Thielemann et al. 1986). In deflagrations, this directly translates into characteristic fuel densities ahead of the flame. At the first stage of the deflagration, the density is higher than $10^{8}$ g cm$^{-3}$. Temperatures rise to $T_{{\rm max}, 9} \equiv 
T_{\rm max}/10^{9}$K $\gsim 6$. At this temperature, NSE applies, and thus the final composition is determined by freezeout processes (represented by $T_{\rm max}$ and $\rho_{\rm max}$) and the efficiency of electron capture reactions. Because of the high density, electron capture reactions are important. Dominant species in this “complete silicon burning with electron capture region” are stable $^{56}$Fe, $^{54}$Fe, 