**Maximum expected signal-to-noise ratio S/N vs. V-magnitude for
a A0 V star with AURELIE grating N° 5 in the second order at
6000 Å. S/N is given for four integration times:
5, 30, 60 and 120 min.
The star is assumed at air mass unity and all the starlight is collected by the
entrance hole. Moreover the factor p = 2
(see Eq. (7).)**