Performance of the TEE based on simulations of trapezoid-shaped transits. The colour of each point indicates the ratio between the measured timing precision and the precision predicted by the TEE, σ_t,meas/σ_t, on the scale shown to the right. The measured precision has been derived from 10000 injection and retrieval simulations; see the text for details. The axes correspond to the simulations’ input variables, which are the signal-to-noise relevant for timing precision (see Eq. 2) and n_∇, which is the combined number of points during ingress and egress.