Evaluation of the strength of the WDH. Top: strength of the WDH contribution in the AO-corrected area of the focal-plane image 𝒮_WDH, defined in Eq. (4), as a function of the filtering fraction (starting at 5%, black dotted line). Bottom: corresponding images from the 51 Eri data set showing low WDH residuals (left), and average (middle) to high (right) WDH. The images corresponding to the green and blue lines look very similar, therefore we only show one here.