Top: observed period spacing patterns (black dots and grey triangles) for the prograde (left) and retrograde (right) modes of KIC 12066947. The black part of the pattern was used to determine f_rot and ΔΠ_l, while the grey section was excluded. The white squares indicate the model fit, assuming these are gravito-inertial modes and using the f_rot and ΔΠ_l values obtained from the analysis of the marked prograde series. The white diamonds indicate the model computed for Rossby waves using the same f_rot and ΔΠ_l values, assuming m = −1 and k = −2 in the k-based indexing scheme by Lee & Saio (1997). Bottom: the residuals of the fit to the prograde period spacing series.