Fig. 2.

Colour–magnitude diagram of our example star (Fig. 1), where the colour is the Gaia (GBP − GRP), and the absolute magnitude is calculated for Gaia G. The filled green circle represents our example star, with age τ = 5 Gyr and metallicity [Fe/H] = −0.5 dex. The black solid line shows the isochrone with the true age and metallicity of the star. The blue and red solid lines show isochrones with [Fe/H] = −1.0 and +0.0 dex respectively, and the dashed lines on the left and right sides of the solid lines are for ages offset by −0.7 and +0.7 Gyr.
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