Two inputs used in our SPHERE simulation model. Left, a map of the amplitude errors measured in the broad-band H filter and normalized to a median value of 1.0. Right, a map of the phase errors measured with the prototype ZELDA wavefront sensor (N’Diaye et al. 2013) installed in SPHERE (see text for details). In this map, the dead or stuck actuators of the SPHERE DM are easily visible as white or black circular spots. The visible actuators at the edge of the central obscuration (dashed circle, 14% of the pupil in diameter) are not dead or stuck, but they are not controlled properly due to their significant overlap with the central obscuration. Without taking into account the dead or stuck actuators, there is ~35 nm rms of aberrations inside the system.