Fig. 14
Relation between [N ii] λ6583/[O ii] λ3727 emission-line ratio and the O3N2 index for the CALIFA inner (red diamonds) and outer (blue crosses) region samples. Data from PINGS inner region sample (black stars), from CNSFR (dark green asterisks) studied by Díaz et al. (2007) and from central region (light green triangle) and IC 132 H ii region of M33 (orange square) studied by López-Hernández et al. (2013) are also included for comparison.
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