Fig. A.1
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Diagnostic diagrams from Baldwin et al. (1981) and Veilleux & Osterbrock (1987) for the full sample. Lines and shaded areas are defined as in Fig. 3. Here, the regions are classified according to the traditional classification criteria. In each row only, from top to bottom, we show: H II regions (green), PNe (blue), shocks (red), ambiguous (grey) and unclassified (black) objects.
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