Fig. 4.
𝒢 functions for the 20 synthetic stars with age 5 Gyr, calculated using all 2MASS passbands together as input. Each row contains the 𝒢 functions for different evolutionary states (labelled on the left hand side), with stars of four different metallicities. The red cross marks the true age and metallicity, and the open red circle marks the most probable point on the map.
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