Fig. B.1

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Same as Fig. 1 but for the transitions J=24−23 and 26−25, observed both with the IRAM 30m and APEX. Each of the four panel represent the best LTE fitted spectra obtained changing the source size for the C3 (purple) component. A source size smaller than 10″ is needed to explain the higher velocity peaks seen with the IRAM 30m, i.e. with a lower angular resolution than with APEX.
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