Effect of the setting of the regularization parameters on REXPACO reconstructions. (a) SURE criterion derived from Eq. (23); (b) comparative reconstructions (first row: μ → 0, i.e., under-regularization; second row: , i.e., estimated optimal regularization; third row: , i.e., over-regularization). Two regions of interest are also displayed with a saturated colormap near the north side extremity of the disk and near the star. Data set: HR 4796A, see Sect. 3.3.1 for observing conditions.
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