Corner plot of the CHEOPS+Spitzer transit-only fit with the placement of Gaussian priors on b, v sin i_⋆, and λ informed by the Doppler tomography. The strategy is described in full in Section 5 and the corresponding results are displayed in Table 3. This approach of using both the CHEOPS and Spitzer light curves and using priors from tomography is the one adopted for the fit to the full set of light curves presented in Section 7.