Comparison of the period spacings derived in this work with reference values, where, for the models, the reference values are computed from the integral of the Brunt–Väisälä frequency (Eq. (8)), and for real data, reference values are observed values from the literature with updated values for KIC 6144777 and KIC 7060732; see text for details. Results for real stars and models are shown with black dots and open red diamonds, respectively.Error bars are mostly smaller than the symbol size. Precise agreement is highlighted by the dotted line.