Top panel: original integrated spectrum for galaxy IC 4215 is shown in black, the best fit to the stellar population appears in red (using the 3745−7500 Å entire spectral range), and pure emission line spectrum (after the subtraction of a residual continuum shape applying a smooth function). This galaxy shows a small equivalent width in the Hβ line. Center panel: same as top panel for the galaxy NGC 2906. Note that in this case the spectrum shows more prominent Hα and Hβ emission lines. Bottom panel: in this case, NGC 5630 shows a typical emission line dominated spectrum with very high EWs of Hα and Hβ emission lines. These spectra show the variety in levels of emission line strength in our galaxies. A proper subtraction of the underlying stellar population is required to obtain the estimation of the emission line fluxes.