Map of the projected merit function (in a log scale) along the log q(core) – Xcore(C+O) plane. At each log q(core), Xcore(C+O) position, the value given is the minimum of log S2 that can be found among the values obtained for all M∗ and log q(H). The best-fit model is indicated by an asterisk, while the model corresponding to the second minimum of the merit function is indicated by a cross. White contours show regions where the frequency fits have S2 values within the 1σ, 2σ, and 3σ confidence levels relative to the best-fit solution.
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