Best-fit two-Kepler LTT model without secular parameter with reduced . The best-fit model parameters are shown in Table 2. In the top panel the LTT signal with smaller/larger amplitude corresponds to the inner/outer companion. The bottom panel shows the residuals between the data and best-fit model. We note that, judging by eye, there is a slight asymmetry in the residuals with O−C > 0 for E> 0.