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Fig. 3

image

Comparison between a star image with subtracted mean background (upper left) and subtracted mean and PCA residual background with 60 principal components (upper right). The star image also shows the area around the stellar PSF which is masked for the fit of the principal components (black rectangle). The image on the bottom shows the corresponding PCA residual background. All images were smoothed with a Gaussian filter to improve the visibility of the background structure.

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