Comparison between the mode trapping parameter ζ of the l = 1 modes of the best-fit model for KIC7581399 computed from the mode eigenfunctions (Eq. (15), black solid line) and the approximate expression computed from the mode frequencies using the prescription of G13 modified in Appendix B (Eq. (B.4), red filled circles and red dashed line). For reference, we also show the computed with the original prescription of G13 (gray dotted line and open circles).