Left: diagnostic diagram of the CALIFA inner region sample (red circles). Data from PINGS inner region sample (black diamonds), from CNSFR (green asterisks) studied by Díaz et al. (2007) and from central region (dark green triangle) of M33 studied by López-Hernández et al. (2013) are also included for comparison. Right: diagnostic diagram of the CALIFA outer region sample (blue circles). Different shades correspond to different bins of distance to the center of the galaxy, as indicated. Point from the IC 132 H ii region (orange square) of M33 studied by López-Hernández et al. (2013) is included for comparison. Overplotted as black lines in both diagrams are empirically and theoretically derived separations between LINERs/Seyferts and H ii regions.