Box plots investigating the choice of stellar radius. Top panel: box plot of the ratio of the pulsation period and sound-crossing time. Bottom panel: box plot of the ratio of the stellar radius and the radius below which the layers are largely in phase. The sound-crossing times and stellar radii are from the six radii definitions tested in the models presented in this work as outlined in Sect. 2.2. Each box plot represents the distribution by drawing the box from first to third quartiles (gi and Q₃, respectively) with a horizontal line drawn in between to denote the median, and the height of the box is the interquartile range (IQR). The bottom and top whiskers are bounded by bars denoting the minimum and maximum values, defined as the lowest and highest values within the range min ≥ 1.5IQR − Q₁ and max ≤ 1.5IQR + Q₃, respectively. Outliers are identified as values being outside of the whisker bounds, denoted by the rhombus symbols in the plot.