Typical effects of modified gravity on theoretical CMB temperature (top panel) and lensing potential (bottom panel) power spectra. An increase (or decrease) of E₂₂ with respect to zero introduces a gravitational slip, higher at present, when Ω_de is higher (see Eqs. (4) and (6)); this in turns changes the Weyl potential and leads to a higher (or lower) lensing potential. On the other hand, whenever E₁₁ and E₂₂ are different from zero (quite independently of their sign) μ and η change in time: as the dynamics in the gravitational potential is increased, this leads to an enhancement in the ISW effect. Note also that even when the temperature spectrum is very close to ΛCDM (as for E₁₁ = E₂₂ = 0.5) the lensing potential is still different with respect to ΛCDM, shown in black.