13CO
¹³CO ground state rotational frequencies calculated and published in 2004 ApJ 611, 615 by G. Cazzoli, C. Puzzarini, and A. V. Lapinov for hf unsplit line centers.
J_up J_low Freq_cal(MHz) sig(m/s) 1 - 0 110201.354280(37) 0.10 2 - 1 220398.684129(66) 0.09 3 - 2 330587.965223(90) 0.08 4 - 3 440765.17346(14) 0.09 5 - 4 550926.28505(25) 0.13 6 - 5 661067.27665(43) 0.20 7 - 6 771184.12546(70) 0.27 8 - 7 881272.8093(11) 0.36 9 - 8 991329.3068(15) 0.45 10 - 9 1101349.5975(20) 0.55 11 - 10 1211329.6617(26) 0.65 12 - 11 1321265.4810(33) 0.76 13 - 12 1431153.0381(41) 0.86 14 - 13 1540988.3171(49) 0.95 15 - 14 1650767.3034(57) 1.04 16 - 15 1760485.9837(66) 1.12 17 - 16 1870140.3472(75) 1.20 18 - 17 1979726.3836(83) 1.26 19 - 18 2089240.0853(92) 1.32 20 - 19 2198677.446(10) 1.38 21 - 20 2308034.463(11) 1.44 22 - 21 2417307.133(12) 1.53 23 - 22 2526491.458(14) 1.65 24 - 23 2635583.441(16) 1.82 25 - 24 2744579.086(19) 2.07 26 - 25 2853474.403(23) 2.41 27 - 26 2962265.401(28) 2.85 28 - 27 3070948.095(35) 3.40 29 - 28 3179518.501(43) 4.06 30 - 29 3287972.638(53) 4.84