Rotational spectra of isotopic species of methyl cyanide, CH3CN, in their ground vibrational states up to terahertz frequencies

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Table 2:

Spectroscopic parameters^a (MHz) of methyl cyanide isotopic species with $C_{\rm 3v}$ symmetry and dimensionless weighted standard deviation wrms.
$\begin{displaymath}\begin{tabular}[t]{lr@{}lr@{}lr@{}lr@{}lr@{}l} \hline \hline ... ...06 & 0&.813 & 0&.760 & 0&.635 & 0&.692 \\ \hline \end{tabular}\end{displaymath}$ ^a Numbers in parentheses are one standard deviation in units of the least significant figures. Parameters without quoted uncertainties have been estimated from the main isotopic species and were kept fixed in the fits; see Sect. 3.

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