Comparison between the emission line EWs measured in galactic SDSS spectroscopic data taken from the MPA/JHU catalogues, EW_{T, spec}, and the emission line EWs derived from the residuals of our fitting code on the same galaxies in ALHAMBRA, EW_{T, phot}. Blue dots indicate galaxies with only one strong emission line in their spectra, i.e. with a reasonably specific or individual emission line measurement in ALHAMBRA, whereas red dots illustrate galaxies with more than one emission line. The black line is the one-to-one relationship, whereas the red line is a linear regression to all the points. The dashed black line is the minimum EW_{T, phot} that we can detect when imposing Δm_EL = 0.1 for a unique emission line in one ALHAMBRA filter. See more details in the text.