Representative spectra to illustrate the modelling and subtraction of the underlying stellar population emission for the LR1 (left) and LR2 (right) data cubes. The selected spaxels show typical emission in the lowest surface brightness area (first row), the peak of continuum emission ♯3, associated to two relatively old clusters (second row), and the peak of emission in Hγ (third row). Each individual graphic contains the observed, modelled and subtracted spectrum in black, cyan and orange, respectively. Below this main graphic there is an auxiliary one showing a zoom of the subtracted spectrum in black together with the spectral regions that were masked from the continuum fitting (green).