NIRSpec-IFU spectra of DG Tau B. Top panel: spectrum in the F100LP/140H grating integrated over a circular aperture with a radius of 1.4″ centered in the blueshifted lobe containing the central source position (Fig. 4b). Many atomic transitions are detected (in particular for [Fe II]). The mid-band value-free gap is associated with the physical separation between the two NIRSpec detectors. Bottom panel: spectrum in the F170LP/G235H grating integrated in the same circular aperture. Many ro-vibrational H₂ transitions are detected, as well as a few [Fe II] and HI atomic transitions. Several photospheric absorption lines, including the CO overtone bands, are observed. The water ice absorption band around 3 μm is clearly visible. The mid-band instrumental gap is also present.