Examining the effect of the stellar mean-density on the pulsation periods. Top panel: extracted fundamental pulsation periods against the mean density. Over-plotted is Ritter’s period-mean density relation (dashed line) fitted to the model points and the dash-dotted line is the unconstrained regressed line based on the model points. Bottom panel: pulsation constant, Q, against the stellar mass-to-radius ratio, f_MR, where the dotted line is the result of a linear regression applied to all the models in this plot.