Top: input-smoothed simulated CMB map (ℓ_max = 10) and the same map, but masked (Fsky = 77%) and not smoothed (i.e., input-simulated data). Middle: inpainting of the top right image up to ℓ_max = 10, using a sparsity prior (left) and an energy prior (right). Bottom: inpainting of the top right image up to ℓ_max = 10, using an isotropy prior (left) and a simple Fsky correction (right).