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Fig. 6

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Lines of OH+ detected in the SPIRE spectra of NGC 6445, NGC 6720, and NGC 6781 obtained in the HerPlaNS programme. The expected positions of the lines are indicated in each plot. The plots show the spectra obtained with the central bolometer; the spectra in black correspond to the pointing towards the centre of each PN, while the blue is centred in the north lobe of NGC 6445, the north rim of NGC 6720, and the west rim of NGC 6781. The surface brightness is given in Jy/arcsec2. See details of the pointings in Figs. 13.

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