Fig. 5.
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Line-ratio maps, corrected for dust attenuation, of our M33 data for a S/N of the lines of interest larger than 2.5. From left to right: [S II]λ6716, 6731/Hα, [S III]λ9069/[S II]λ6716, 6731, [O III]λ5007/[S II]λ6716, 6731, and [O III]λ5007/Hα. Black contours indicate the dendrograms classified as H II regions. In the S II/Hα maps (panel a), the purple dashed contours show the level value of 0.35.
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