**Table 1:** Spectroscopic measurements of the ground vibrational state of CH₃CHDCN, CH₂DCH₂CN and CH₃CH₂C¹⁵N.
Number of measured lines			J max	$K_{\rm a}$ max	Standard
	8-39 GHz	150-660 GHz			deviation^a (kHz)
CH₂DCH₂CN in-plane	45	415	80	28	27
CH₂DCH₂CN out-of-plane	58	496	74	29	28
CH₃CHDCN	55	222	71	29	57^b
CH₃CH₂C¹⁵N	67	270	78	31	64^b

^a Calculated from the median of absolute deviations; ^b for the millimeter wave transitions,
the standard deviation of the microwave transitions is 16 kHz.

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