Spectra of the relative rate of period change ﹩\dot{P_{k}}/ P_{k}﹩ as a function of the reduced period ﹩P_{k}[ l( l+1) ] ^{1/ 2}﹩ for g‐modes with ﹩k=1{\mbox{--}} 30﹩ and ﹩\ell =1{\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.