Left: comparison of the spectral fit of the O₂ Raman line region from two consecutive MUSE exposures, with and without laser propagation. The black dots trace the spectral flux density F _λ integrated within the central 30″ of the MUSE field of view. The dark gray line denotes the sky and background components (only) of the fit. The full fit (which includes the Raman line) is shown in red. For the observations acquired with no laser propagation, the flux of the Raman lines is fixed at 0. Right: idem, but for the spectral region around the N₂ Raman line.