Illustration of the annulus-wise PCA post-processing and merit function evaluation used in the negative fake companion technique. Left: no NEGFC was injected before annulus-wise PCA processing. Right: a NEGFC was injected at the position and flux minimizing the merit function. The white circle illustrates the fixed circular aperture from which the pixel values Ij have been extracted to evaluate the merit function. The same color-scale was used for both images.
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