2D joint posterior probabilities of the fit of the CHEOPS data using the Gauss+Gauss model: The full model is described in Section 4.1. For clarity, we only display a subset of the parameters of the model: A₀ and A₁ are the amplitudes of the broad and narrow Gaussian components of the model respectively. ϕ₁ is the average phase offset of the narrow Gaussian component and σ₁ is its standard deviation, both expressed in radians.