Top panels: VLT/SPHERE/ZIMPOL observation on 2018 July 10th deconvolved using 25 different Moffat parametric PSFs. Each image of Vesta is cropped to 200 × 200 pixels for best enlargement, and scaled by its maximum intensity for optimum image dynamics. Bottom panels: corresponding FWHM and Strehl ratio for the 25 PSFs. Values indicate the FWHM and Strehl ratio, respectively, while the colour map (dark for low values, white for high values) helps to visualise the diagonal trend discussed in the text.
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