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Fig. 4

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Rotational transitions JKa,Kc = 145,10 ← 144,11 and JKa,Kc = 125,8 ← 124,9 of asymmetric mono-deuterated DME in the vibrational ground state at 230 GHz. Stick spectrum below experimental lines represents the prediction given by ERHAM. The internal motion of the CHD group is observed through the A and E components, which are split into two substates. It is also noticeable that this separation increases as J decreases and it is more intense in the E component. The experimental measurements are peaked in the center of the doublet. The spectrum intensity scale is arbitrary.

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