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Fig. 3.

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EW(Hα) in H II regions (blue) and DIG (orange) in the PHANGS–MUSE sample. DIG and H II regions are defined according to a morphological criterion (using HIIPHOT; see Sect. 2.3). The 16th, 50th, and 84th percentiles of the distributions are shown with dashed lines on each violin. Dashed horizontal black lines represent demarcations employed in the literature to distinguish H II regions from DIG (3 and 14 Å) and the value of EW(Hα) from HOLMES using the PEGASE models (1.1 Å). The blue and orange horizontal lines (and associated colour-shaded areas) represent the 50th (16th and 84th) percentiles of the EW(Hα) distribution for H II regions and DIG across all galaxies.

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