Fig. 3
Top panel: RGB slope as a function of metallicity. The solid black line is the best-fit quadratic function, as given in the equation in the bottom left corner. Grey lines give the 1σ, 2σ and 3σ confidence ranges of the the best fit relation. Bottom panel: weighted orthogonal residuals, i.e. the orthogonal distances to the best fit line divided by the respective uncertainties.
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