Fig. 19

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Improvement of the suppression of the on-axis star with better centring of the FPC in NIX (images are displayed with a square-root stretch). The left image has an offset between the star and the coro-nagraph of about 1 λ/D (95 mas), at which point the suppression is about a factor of 2. The right image shows a well-centred image, where the rejection of the stellar light is more than a factor 100. The scale is shown; for reference the FWHM in L′ band is 97 mas and the first Airy ring has a diameter of 310 mas.
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