We present a study of recent solar neutrino data using a Bayesian method. Assuming that only $ u_e$ are observed in the Super-Kamiokande experiment our results show a marked supression of the survival probability at about 1 MeV, in good agreement with $chi ^2$-based analyses. When the detection of $ u_{mu}$ by Super-Kamiokande is taken into account, assuming $ u_e$ to $ u_{mu}$ oscillations, we find the largest suppression in survival probability at about 8.5 MeV.
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