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Fig. 5

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Lines of OH and OH+ detected in the PACS spectra of NGC 6445, NGC 6720, and NGC 6781 (in this case, for both the centre and rim pointings) obtained in the HerPlaNS program. The left panels show the OH doublet, while the panels on the right show the OH+ lines. The expected positions of the lines are indicated in each plot. The spectra are obtained by integrating the flux of spectra extracted from all individual spaxels and dividing by the total aperture. The surface brightness is given in Jy/arcsec2. See details of the pointings in Figs. 13.

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