Comparison, in the coronagraphic configuration (FPM diameter: 4.4λ/D), of (left) the phase reconstructed by COFFEE subtracted by a reference phase (in nanometers), also reconstructed by COFFEE (95.0 nm RMS), (center) the theoretical phase (in nanometers) issued from the command sent to the Iris-AO (92.3 nm RMS), and (c) the reconstruction error phase (in nanometers), that is, the difference between the two previous phases, when random piston values are applied on the Iris-AO. The three phases are on the same scale.