Fig. A.1.
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Performance of the XGBoost model in predicting stellar masses and radii for RGB stars. The top and bottom panels show the true vs predicted values for mass and radius, respectively, based on the validation set. The reference values are asteroseismic measurements from the APOKASC-3 catalogue. The model achieves typical fractional uncertainties of ∼15% for mass and ∼7% for radius, with small systematic bias.
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