Échelle spectrum of the star KIC 2575024. Radial modes, in red, and quadrupole modes, in green, appear at x ≃ 0 and x ≃ −0.16, respectively, where x = ν/Δν − (n_p + ε). Most of the dipole mixed modes can be fit with the two-cavity asymptotic expansion (m = ±1 doublets, identified as blue and purple peaks). Extra peaks indicated by green diamonds are observed at different frequency ranges. The dashed line represents a threshold of eight times the background.