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Fig. 1


PACS CH+ 3–2 lines (black, centered on the CO+ peak) overlaid on the distribution of the CO J = 6−5 peak brightness temperature (color image) observed with the CSO telescope at  ~11″ resolution (Lis et al. 1998). The PACS line intensity distributions are shown in units of Jy/spaxel as a function of wavelength in μm and are not velocity resolved. White contours show the brightest regions of H–0 S (1) emission (Walmsley et al. 2000). Lower-intensity H extended emission is present in the entire field (Van der Werf et al. 1996). Violet stars show the position of the H13CN J = 1–0 clumps deeper inside the Bar (Lis & Schilke 2003).

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