The best guide for exposure times is usually to check in the observing log book for an application similar to your own (particularly spectrograph configuration, wavelength and detector) and noting the exposure times and counts.
Il s'agit alors de noter les temps de pose et le nombre de comptes obtenus. CONFIGURATIONS DU SPECTROGRAPHE DU TELESCOPE DE 1,8 M NOM DENSITE DU RESEAU r/mm BLAZE