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Limits to Ionization-parameter Mapping as a Diagnostic of HII Region Optical Depth

Authors: Amit N. Sawant, Eric W. Pellegrini, M. S. Oey, Jesús López-Hernández, Genoveva Micheva

Amit N. Sawant et al 2021 The Astrophysical Journal 923 .

Caption: Figure 3.

Narrowband [O III] online (a) and offline (b) images of M33. The five regions with varying background levels are shown.