Synthetic ISL spectra based on the STELIB spectral library. The spectra are shown for different magnitude intervals: total starlight m > 0 mag (black); m > 12 mag (blue); 0 < m < 12 mag (green). In order to demonstrate the agreement between the total ISL and the 0 < m < 12 mag spectra, a scaled version of the latter (in red) is overplotted on the total spectrum. A suitably re-scaled GAIA/RVS spectrum is shown as the magenta line overplotted upon the model spectrum for 0 < m < 12 mag (blue line). Because of the difference in baseline slopes, the GAIA/RVS spectrum has been cut at 8590 Å and is shown as two pieces.