Fig. 2.
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PN(2−1) (left) and PN(3-2) (right) transitions towards the GMCs 6 (upper panels) and 4 (lower panels) of NGC 253. The spectra have been extracted towards the peak of the continuum. The best LTE fits to the line emission are indicated in red. In blue and yellow we show the expected line profiles for PN(3−2) assuming Tex of 10 and 15 K, respectively.
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