Example of a simulated NIRSpec MOS spectrum. Top panel: Sub-image containing the spectral trace extracted from one of the simulated count-rate images in PRISM mode of a mock galaxy at z = 9.52 having a mass of M = 2.9 × 10⁸ M_ʘ, a UV luminosity of ~ 3.6 × 10²⁸ erg s^–1 and an AB magnitude of 27.6. Bottom panel: the matching final reduced 1D spectrum plotted in orange. The blue line shows the input spectrum from JAGUAR, and the grey line the profile expected from binning the input spectrum to the detector sampling.