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Fig. 2.

image

Residuals when fitting the colour–metallicity distribution shown in Fig. 1 with a linear (left), a quadratic (middle) and piecewise linear function (right), respectively. Coloured points show the observed scatter and the contours give a kernel density estimation using an arbitrary Gaussian kernel for visualisation of the residual shape. The dotted vertical line in the middle panel shows where the quadratic model diverges.

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