Outline of the data reduction flow for NIRSpec IFS exposures. Top: “Generic” preprocessing that converts raw up-the-ramp integrations into count rate maps containing the number of counts per second received by every detector pixel. This portion of the data reduction is common to all NIRSpec observing modes, and in fact all NIR instruments on board JWST. Bottom: starting with the count rate maps, flow describing the extraction, flux and wavelength calibration, and rectification of each of the 30 slice spectra, so that they can be combined into a three-dimensional data cube per exposure. The combination of multiple dithered exposures into a single “hyper cube” is not shown but will be needed to recover full spatial information.