Comparison of the Hα+[NII] equivalent widths (left) and fluxes (right) of the HRS galaxies with independent measurements available in the literature. Red filled dots indicate galaxies with multiple observations done in this work, blue filled dots galaxies with data already published by our team (Boselli & Gavazzi 2002; Boselli et al. 2002; Gavazzi et al. 2002, 2006), magenta, green, cyan, and black symbols Hα+[NII] measurements from Sánchez-Gallego et al. (2012), Kennicutt & Kent (1983; corrected by a factor of 16% as suggested by Kennicutt et al. 1994), Romanishin (1990), or from other references in the literature, respectively. The solid line shows the 1:1 relation.