Fig. 5.
Left panel: zoomed (5″ × 5″) K-band image of SDSS J1431+4358 taken with LBT+LUCI+FLAO in diffraction-limited mode. Right panel: normalized radial profiles in the K-band, measured within circular annuli centered on the target (SDSS J1431+4358, red points) and on the point-like source (blue points) used for the PSF reconstruction at about 5.5″ from the target (see Sect. 3.2).
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