Detectability of tau Cet e and f in each CGI configuration, following the same colour code as in Fig. 8. In the left panels, black lines correspond to orbital realizations without an inclination constraint. Solid red lines correspond to orbital configurations with 25° < i < 45°, coplanar with the debris disc of the system (Lawler et al. 2014). For this case, the inclination is sampled from a uniform distributionwithin the quoted limits. The green histograms in the right panels show the posterior distributions of α_obs.