Evolutionary diagram for a solar stellar track with M = 1 M_⊙ and [Fe/H] = 0 dex, plotting the large frequency separation Δν and luminosity L as a function of effective temperature T_eff. The colour bar indicates the number of dipole modes in a Δν-wide frequency range around ν_max, according to Eq. (4). The three classifications from top to bottom denote the tip (TRGB), middle (MRGB) and lower RGB (LRGB).