Fig. 1

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Rotational diagram of (a) vinyl cyanide (C2H3CN) and (b) its one istotopologue (13CH2CHCN). The best fitted rotational temperature and column density are given in each panel. Filled blue squares are the data points and the blue line represents the error bar. The error bar of each transition is calculated from rms noise (varies 117 mK to 306 mK) and calibration error (considering 5%).
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