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The James Webb Space Telescope (JWST) was launched on December 25, 2021. Thisdocument presents a simulation of the Near Infrared Spectrograph (NIRSpec)observations of the Orion Bar which will be performed as part of the EarlyRelease Sciences (ERS) program "PDRs4all". The methodology to produce this datarelies on the use of a direct forward model of the instrument applied to asynthetic scene of the Orion Bar, coupled to format matching in order todeliver data in JWST-pipeline data format. The resulting 3D cube for one orderis provided publicly, and is compatible with tools developed by the STScI (e.g.Cubeviz) and with the science enabling products developed by thePDRs4all team.This cube can be used as a template observation for proposers who would like toapply for NIRSpec observations of extended sources with JWST.

PDRs4all: NIRSpec simulation of integral field unit spectroscopy of the Orion Bar photodissociation region