Experimental result of iMZ signal calibration using the asymmetric output, with three different phase offsets applied to the DM in addition to the phase diversity steps required to perform the calibration. First row: peak-to-valley ≈140 nm, σ² ≈ 0.06 rad². Second row: peak-to-valley ≈ 250 nm, σ² ≈ 0.1 rad². Third row: peak-to-valley ≈310 nm, σ² ≈ 0.5 rad². The first line correspond to raw focal plan images produced behind the pinhole with the three DM settings. The second line shows the pupil plane signal of the asymmetric output. Lines 3 to 5 show the measured calibration parameters N α_a, Nβ, and ϕ estimated with weighted least mean square method for these three DM settings. The DM shape is shown for comparison on the last line.