Data products of the NIRSpec IFS mode. Top: example count rate map (obtained with internal lamp illumination during ground testing), showing the two NIRSpec detectors side-by-side. The numbering scheme of the 30 slices is indicated, as is the location of the ever-present fixed slit spectra. Also highlighted are a number of “contamination” spectra caused by failed-open MSA shutters. Bottom left: example “channel map” of a reconstructed data cube (created from simulated science data). The individual slices are identified by number as in the top panel. Bottom right: G235H spectra (extracted from the simulated data cube) for three arbitrary spaxels, illustrating the gap in wavelength coverage caused by the physical separation between the two detector arrays. We note that the exact gap position varies between slices, as described in Sect. 4.