Notes. Units are in MHz except for which is in km s-1, B and D are taken from McCarthy et al. (1995). The numbers in parentheses represent one standard deviation in units of the last significant digits. Note that the rotational constants of CCH and 13CCH are 43674.52894 MHz (M ller et al. 2000) and 42077.462 MHz (McCarthy et al. 1995), respectively.
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