Left panel: map of the projected merit function (on a log scale) along the M∗ – log q(H) plane. Right panel: zoom of the left panel in the region of interest. At each M∗, log q(H) position, the value given is the projected merit function, i.e., the minimum of log S2 that can be found among the values obtained for all log q(core) and Xcore(C+O). The best-fit model is indicated by an asterisk, while the model corresponding to the second best-fit model 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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