Dimethyl ether: laboratory spectra up to 2.1 THz - Torsion-rotational spectra within the vibrational ground state

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Table 1:

Characterization of the different datasets used in the fit.
Source^a	# of Transitions^b	Max. J	Max $K_{\rm a}$	Frequency [GHz]		$\sigma$
				Min.	Max.
Synthesizer (Cologne)	344 (259)	54	19	39	56	1.02
BWO (Cologne)	586 (273)	70	27	69	897	0.90
BWO + SL (Cologne)	1663 (635)	63	27	263	2099	0.95
Multiplier chain (JPL)	2234 (435)	67	30	780	1665	1.08
Niide & Hayashi (2003)	16 ( 13)	7	2	12	25	1.77
Durig et al. (1976)	20 ( 15)	4	1	29	36	0.50
Lovas et al. (1979)	191 (157)	22	6	9	112	0.74
Neustock et al. (1990)	79 ( 66)	24	5	63	222	0.96
Groner et al. (1998) (Klystron)	962 (702)	25	6	94	544	1.08
Groner et al. (1998) (FASSST)	735 (386)	49	10	263	340	0.85

^a The first four rows summarize transitions measured within this work.
^b The number of assigned transitions is given followed by the number of different frequencies in parentheses. The last column shows the unitless standard deviation of the dataset in the fit.

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