Fig. 1.

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Colour–temperature relation of the MSTO stars in the working sample (colour-coded according to metallicity) and the isochrone models (blue points on a straight line), for the original derived AMBRE effective temperatures (left panel) and after the offset correction in Teff (right panel). The linear Theil-Sen estimator method (red line) was applied to the stellar parameter values. The green lines delimiter the lower and upper bound of the 95% confidence interval of the Theil-Sen linear regression method. Middle panel: observed linear Teff–offset (ΔTeff = Teff, MODEL − Teff, OBSERVATION) for different metallicity values.
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