Spectra of the relative rate of period change ﹩\dot{P_{k}}/ P_{k}﹩ as a function of the period P_k for p‐modes with ﹩k=0{\mbox{--}} 10﹩ and ﹩\ell =0{\mbox{--}} 3﹩. Each ensemble of two panels refers to a given evolutionary sequence. The upper (lower) panel corresponds to a representative model belonging to the first (second) phase of EHB evolution. The model number is indicated in the upper right‐hand corner of each panel.