QPE timing from the impact model. We show T_rec, P_app, e_app, and the O–C diagrams for a nearly circular EMRI orbit with eccentricity e = 0.05, and parameters commensurate with those of GSN 069. Odd and even QPEs are shown in red and blue respectively. We point out that the data points in the lower panels (O–C diagrams) are not exactly aligned with those in the upper ones. This is because the abscissa of a given data point in O–C diagrams is a multiple of P_trial rather than the observed QPE arrival time.