Common behaviour of an IFS spectral cube sorted in decreasing order of the S/N. The figure corresponds to a VIMOS-IFU cube section containing 1000 spaxels of an IFS observation of the nearby LIRG IRAS F06295-1735 with continuum emission. The vertical axis shows the S/N calculated on a relatively featureless narrow continuum band at λ_c = 6200 Å for each spaxel of the 3D cube, while the horizontal axis corresponds to the spaxels ordered by decreasing (S/N)_c. Few spaxels have high S/N (i.e.  > 10), decreasing rapidly to values for which the continuum is dominated by noise (S/N_c ~ 1).