Double-logarithmic plot of linear period changes, $\dot{P}$, against P_puls. Yellow stars show values determined using Δϕ from our template fitting analysis if $|\dot{P}|/{\sigma }_{\dot{p}}\ge 3$. Blue circles were measured based on photometry by Csörnyei et al. (2022). Green straight lines are theoretical predictions from Fadeyev (2014, dotted line represents first crossing), blue, red, and black lines are theoretical predictions from Anderson et al. (2016c, for first overtones (thin lines) and fundamental modes with three rotation rates, cf. their Sect. 3.7 and Fig. 13). Left panel: negative $\dot{P}$ indicative of a second instability strip crossing. Right panel: positive $\dot{P}$ indicative of a third (rarely: first) instability strip crossing. Overall, we find good agreement between our template fitting-based $\dot{P}$ and the literature as well as stellar models.