Separation of continuum and line contributions for cores #5 and #11 as examples. The spectra are spatially averaged over the source size. The grey horizontal line across the observed spectra (in black) is the continuum level obtained by the method of Molet et al. (2019). Below this line, the grey area represents the continuum integrated flux. Above this line, the blue area is the continuum brightness of the lines, which is estimated in each channel depending on the noise, whose 1σ and 2σ values are represented by horizontal lines.