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Table 1

Laboratory frequencies of HDCCC.

 –  Frequency Unc. O−C a
(MHz) (kHz) (kHz)

10,1  – 00,0 19 384.5098 2 0.5
21,2  – 11,1 38 283.5891 2 −0.6
20,2  – 10,1 38 768.0019 2 1.0
21,1  – 11,0 39 251.4274 2 −0.1
50,5  – 40,4 96 902.196 20 0.6
60,6  – 50,5 116 271.438 20 −6.5
70,7  – 60,6 135 634.586 20 −8.5
80,8  – 70,7 154 990.661 20 26.6
90,9  – 80,8 174 338.544 20 −13.6
100,10  – 90,9 193 677.324 20 −40.1
101,9  – 91,8 196 204.056 24 −15.1
121,12  – 111,11 229 614.027 23 55.9
122,11  – 112,10 232 512.813 20 −6.9
123,10  – 113,9 232 544.540 21 57.5
123,9  – 113,8 232 546.625 21 −34.7
122,10  – 112,9 232 775.855 20 −6.1
121,11  – 111,10 235 415.394 19 22.5
131,13  – 121,12 248 731.752 19 −24.1
130,13  – 120,12 251 629.269 20 32.3
132,12  – 122,11 251 875.722 20 −15.2
133,10  – 123,9 251 927.366 33 −42.7
131,12  – 121,11 255 015.024 20 −28.7
141,14  – 131,13 267 845.608 37 −56.7
142,13  – 132,12 271 235.509 12 8.1
143,12  – 133,11 271 303.986 41 41.2
143,11  – 133,10 271 308.664 28 −29.1
142,12  – 132,11 271 653.245 20 13.6

Notes.

(a)

Calculated with the spectroscopic constants in Table 2.

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