Transit-timing variations for the WASP-148b planet. In the upper panel, the curves correspond to numerical simulations for the solution shown in Table 6 with i_c = 90°, Ω_c = 0° (coplanar orbits, in red), or with i_c = 60°, Ω_c = 0° (mutual inclination I = 30°, in blue). The dots correspond to the observed TTVs (Table 3). For comparison, the lower panel presents curves corresponding to coplanar solutions with lower eccentricities, within our 95%-HDI: e_b = 0.18, e_c = 0.29 (in orange) or e_b = 0.11, e_c = 0.21 (in green).