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Fig. 4


a) Brightness ratio map derived from the SW continuum averaged over the range of 88–131 cm-1 that is divided by the LW continuum over 66–87 cm-1. The dashed squares indicate the aperture regions used to obtain the spectra shown in Figs. 2c and d. b) [OIII] 88 μm line intensity map overlaid on the contours of the [NII] 122 μm line intensity. The contour levels are linearly scaled from 4 × 10-7 to 1.5 × 10-6 W m-2 sr-1.

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