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Table 1:

Lower state quantum numbers of rotational transitionsa of CH3CN from present work, frequencies (MHz), uncertainties unc. (kHz), and residuals o-c (kHz) between observed frequencies and those calculated from the final set of spectroscopic parameters.
J'' K'' Frequency unc. o-c
86 15 1584230.365 150 -155
86 14 1585042.686 100 39
86 13 1585800.110 100 4
86 12 1586502.584 50 -32
86 11 1587149.953 50 35
86 10 1587741.807 50 39
86 9 1588277.964 50 22
86 8 1588758.221 50 -15
86 7 1589182.509 50 44
86 6 1589550.454 50 -11
86 5 1589862.092 50 -2
86 4 1590117.262 50 32
86 3 1590315.822 50 50
86 2 1590457.643 50 -1
86 1 1590542.824 50 34
86 0 1590571.147 50 -28
87 9 1606303.437 100 75
87 8 1606788.347 50 71
87 7 1607216.562 50 -25
87 6 1607588.178 50 50
87 5 1607902.790 50 35
87 4 1608160.351 50 6
87 3 1608360.834 50 36
87 2 1608504.060 50 25
87 1 1608590.002 50 3
87 0 1608618.661 50 3
88 10 1623774.391 50 9
88 9 1624320.812 50 -33
88 8 1624810.328 50 -27
88 7 1625242.737 50 13
88 6 1625617.728 50 -56
88 5 1625935.334 50 -57
88 4 1626195.369 50 -52
88 3 1626397.725 50 -47
88 2 1626542.355 50 -11
88 1 1626629.131 50 -14
88 0 1626658.067 50 -7

a Transitions are $J'' +1, K'' \leftarrow J'', K''$ for all isotopologs except for CH2DCN.


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