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Fig. 1

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Typical spectrum of the diffuse ionized gas (upper panel) from a region 260 pc above the galactic plane of NGC 1963 compared to that of a “classical” H ii region (lower panel) from the galactic disk of NGC 55. Shown is ν times the measured flux Fν (normalized to Hβ) vs. the wavelength.

This figure is made of several images, please see below:

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