χ² map showing the compatibility between the observations of a phase-locked CoRoT-7b with a 0.3 Bond albedo and a family of models with various possible albedos and rotation periods, with an inertia-layer thickness of 25 cm. The different contours correspond to the regions where the confidence level for the phase-locked model is 90%, 99%, and 99.99% in the two-parameter space. The gray rectangle corresponds to usual 1σ incertainties (68% confidence level) when we independently study each one of the parameters, while the other is kept constant.