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A three-neutrino analysis of oscillation data is performed using the recent,more finely binned Super-K oscillation data, together with the CHOOZ, K2K, andMINOS data. The solar parameters, $\Delta_{21}$ and $\theta_{12}$, are fixedfrom a recent analysis, and $\Delta_{32}$, $\theta_{13}$, and $\theta_{23}$ arevaried. We utilize the full three-neutrino oscillation probability and an exacttreatment of the Earth's MSW effect with a castle-wall density. By includingterms linear in $\theta_{13}$ and $\varepsilon := \theta_{23} - \pi/4$, we findasymmetric errors for these parameters $\theta_{13}=-0.07^{+0.18}_{-0.11}$ and$\varepsilon=0.03^{+0.09}_{-0.15}$. For $\theta_{13}$, we see that the lowerbound is primarily set by the CHOOZ experiment while the upper bound isdetermined by the low energy $e$-like events in the Super-K atmospheric data.We find that the parameters $\theta_{13}$ and $\varepsilon$ are correlated --the preferred negative value of $\theta_{13}$ permits the preferred value of$\theta_{23}$ to be in the second octant, and the true value of $\theta_{13}$affects the allowed region for $\theta_{23}$.

Implications of the Super-K atmospheric data for the mixing angles $\theta_{13}$ and $\theta_{23}$