Left (WFS): geometry of the 12 wavefront sensor sub-apertures inside the pupil (red circle). Each sub-aperture (grey) is 16 × 16 pixels. Only the central 6 × 6 pixels (dark grey) are processed by the real-time controller. Right (DM): geometry of the deformable mirror at the M6 location. The 28 mm diameter pupil (red circle) is smaller than the DM clear aperture (black circle). Out of the 241 available actuators (grey), ∼145 actuators participate in the wavefront correction (dark grey).