Fig. 15
a) (Upper panel) map of intensity ratio between [N II] and Hα (proportional to circle size) from 1-g model fits, superimposed to the same VPHAS+ image as in Fig. 1. Blue (cyan) circles refer to pure-sky (faint star) fibres. Triangles have the same meaning as in Fig. 1. b) (Lower panel) map of [S II] 6731/6717 intensity ratio (proportional to circle size, and increasing with density). Symbols as in panel a.
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