Images and spectra obtained from the MAP near-field imaging on simulated data. The leftmost column shows the exact case where the instrumental polarization is accounted for in the inversion. The next two columns show the inexact case corresponding to simulated data containing both off-grid and polarization-induced errors for Tikhonov and Laplacian regularization at ρ = 1.3 × 10⁻³ and 4.3 × 10⁻³, respectively. The top panels show the frequency-averaged images, and the bottom panels show the relative errors in the spectrum recovery for the three cases. The spectrum errors for the non-optimal ρ values are shown in faded colors.