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Fig. 6

image

All Zernike modes introduced with 400 nm PtV and measured with ZELDA. In these maps, the regular pattern of actuators is clearly visible. The dead or stuck actuators of the SPHERE DM appear as white or black circular spots because they are far beyond the linearity range of the sensor. The actuators visible at the edge of the central obscuration (14% of the pupil in diameter, numerically masked in these maps) are not dead or stuck, but they are not controlled properly because they significantly overlap with the central obscuration.

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