Two examples of fake tracks (dashed black lines) created to avoid the interpolation between tracks with different evolutionary paths. The orange line shows the track with the mass above the transition (track A), and the blue line indicates the track with the mass below the transition (track B). The left-hand panel shows the fake track created for the transition RGBT-HB (enclosed by tracks with 0.75 and 0.8 M_⊙), while the right-hand panel shows the fake track for the AGBm-AGB transition (enclosed by tracks with 0.8 and 0.85 M_⊙). All the tracks are computed with Z = 0.002 and Y = 0.249. See details on the fake track creations in the text