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Fig. 4

image

Residual from the subtraction of the off-axis PSF taken right after the sequence and a different PSF taken some months before for H2 filter (right) and H3 (left). The peak-to-peak variation is about the 5–6% of the PSF flux and the standard deviation of the central zone (12 × 12 px) is 1%.

This figure is made of several images, please see below:

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