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Table 2

Error statistics of the RBF in predicting sodium abundance (A(Na)) from the predicted normalized flux in the leave-one-out cross validation on the 3D NLTE grid.

λ[Å] RMS(∆A(Na)) [dex] MAD(∆A(Na)) [dex] s
5682 0.060 0.012 10−5
5688 0.059 0.013 10−5
5889 0.061 0.027 10−1
5896 0.059 0.026 10−1
6154 0.051 0.012 10−8
6160 0.054 0.013 10−7
8183 0.083 0.015 10−4
8194 0.084 0.017 10−3
10 747 0.037 0.009 10−10

Notes. The columns show the root-mean-square (RMS) and the median absolute abundance deviation (MAD) of the corresponding RBF model with optimised hyperparameter s.

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