General properties of the J-PLUS DR1 local sample at z ≤ 0.017. Upper left panel: distribution in the r-band apparent magnitude. The three sub-samples with different distance information are labeled in the panel (see Sect. 2.3.3, for details). Upper right panel: distribution in Hα flux. Lower left panel: redshift distribution of those galaxies in the sample with z_spec. Lower right panel: Hα luminosity vs. redshift for those galaxies in the sample with z_spec. The solid line marks the luminosity for a galaxy with log F_Hα = −13.2 as reference.