I briefly review the effects of flavor conversion of neutrinos from stellar collapse due to masses and mixing, and discuss the motivations for their study. I consider in detail the sensitivity of certain observables (characteristics of the energy spectra of vc and ue events) to the 13-mixing (sin~2 θ_(13)) and to the type of mass hierarchy/ordering (sign[Δm_(13)~2]). These observables are: the ratio of average energies of the spectra, r_E = /, the ratio of widths of the energy distributions, r_Γ = Γ/Γ-bar, the ratios of total numbers of ve and Pe events at low energies, 5, and in the high energy tails, Rtau-I show that regions in the space of observables r_E, r_Γ, R_(tail) Rtail exist in which certain mass hierarchy and intervals of sin2 #13 can be identified or discriminated.
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