Fig. D.1
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Residual average stacked spectra for H II (blue) and DIG (orange) for each field. The field is indicated in the top right corner of each panel. The main nebular emission lines that are of interest in this work are annotated in the top panel. Bad pixels that were omitted in the pPXF fit are grayed out. The y-axis has units of 10−20erg/s/cm2/Å and is truncated at half the Hα flux.
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