... JWST . ... The tables and plots show the limiting detectable continuum (in nJy) and (narrow unresolved) line fluxes (in erg/s/cm 2 ) as a function of wavelength for the R=100 prism and R=1000 and R=2700 grating modes (three gratings each). ... R=100 mode shall reach a limiting continuum flux of 132 nJy at 3.0 m at S/N=10 in t=10,000 s. R=1000 mode shall reach a limiting line flux of 5.72E-19 erg/s/cm 2 at 2.0 m at S/N=10 in t=100,000 s (note the increased exposure time for all R=1000 sensitivities)....