Surface brightness of the Lyα halo in the wavelength interval 6638.75–6665.00 Å. A 2D Gaussian smoothing kernel is applied across the spatial directions of the cube with σ = 1.5 px. The centroid of the NIRCam Hα emission is marked with a red cross. The dotted, dashed, and solid lines show the surface brightness contours corresponding to a S/N = 1, 5, and 10, respectively. The 1σ SB limit corresponds to 2 × 10⁻¹⁹ erg s⁻¹ cm⁻² arcsec⁻².