Variation of the S/N per spectral element in end-of-mission RVS spectra with G_RVS. The inset is a zoom of the fainter magnitudes. The discontinuity at G_RVS = 10 is due to the on-chip binning of the spectrum in the dispersion direction for fainter stars, and that at G_RVS = 7 is due to on-chip binning perpendicular to the dispersion direction for fainter stars. In addition to the formal noise model errors, an additional error of 0.3% in the flux has been added in quadrature to accommodate calibration and normalization errors.