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Fig. 3.

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Total intensity images of the three transitions on the same flux scale (Jy beam−1 km s−1). These images were made from data cubes convolved to the same resolution of 0 . $ \overset{\prime \prime }{.} $45 × 0 . $ \overset{\prime \prime }{.} $34 (2.1 × 1.6 kpc; see Sect. 2). In all three panels, the 87-GHz continuum is overplotted with contour levels at 1 and 9 mJy beam−1.

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