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Fig. A.1


Distribution of the ~5000 H ii regions included in our sample across four classical diagnostic diagrams: top left panel, [O iii] λ5007/Hβ vs. [O ii] λ3727/Hβ; top right panel, [O iii] λ5007/Hβ vs. [S ii] λ6717, 31/Hβ; bottom left panel, [O iii] λ5007/[O ii] λ3727 vs. [N ii] λ6583/Hβ and bottom right panel, [O iii] λ5007/[O ii] λ3727 vs. [S ii] λ6717, 31/Hβ. In each panel, the contours show the density distribution of the H ii regions within considered diagram, with the outermost contour enclosing 95% of the regions, and each consecutive one enclosing 20% less regions. The color indicates the average luminosity weighted age of the underlying stellar population at the corresponding location in the diagram. The solid line represent the classical demarcation line used to select H ii regions.

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