Optimal regularization parameters for image and spectrum recovery in MAP near-field imaging. The image recovery metric (left panel), the spectrum recovery metric (middle panel), and the log evidence (right panel) are shown as a function of ρ for Tikhonov and Laplacian regularization for both off-grid and polarization-induced errors. The ρ_max corresponding to the peak values are indicated with blue arrows, except for the spectrum recovery metric for Laplacian regularization where a clear peak is not present.