Ratio between the OTELO Hα LF of the total sample of emitters at z ∼ 0.40 and that of the star-forming galaxies only. Bars are the sum in quadrature of the Poissonian errors of both LF, as given in Table 2. The blue solid line represents a error-weighted linear fitting to the ratio values. The red horizontal line corresponds to a ratio equals unity. The blue dashed vertical line represents the luminosity above which the AGN contribution becomes relevant.