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Fig. K.2
Fresnel diffraction of the Lyot stop with an optical vortex coronagraph. We present the real and the imaginary parts of the 
function for four different Fresnel number N. The last figure shows the residual intensity in the coronagraphic pupil plane when we choose a dc radius of 86% (vertical dotted line).
This figure is made of several images, please see below:
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