Data points in the catalogue of M31 AGB stars by G22 are shown with grey points on the colour-magnitude (F110W−F160W, F160W) plane. Solid lines represent the AGB evolutionary tracks of model stars of different mass and metallicity, with connecting points that correspond to evolutionary stages taken in the middle of each inter-pulse phase. The different lines refer to the evolution of the M = 0.65 M_⊙ star of metallicity Z = 10⁻³ (triangles), and to the solar metallicity model stars of mass M = 0.8 M_⊙ (pentagons), M = 1.05 M_⊙ (stars), M = 2.5 M_⊙ (squares), M = 3.5 M_⊙ (diamonds), and M = 5 M_⊙ (circles). The different panels provide information on the luminosity of the model stars (top, left), effective temperature (top, middle), (gas) mass loss rate (top, right), surface C/O ratio (bottom, left), DPR (bottom, middle), and optical depth at 10 μm (bottom, right).