**Table 2:** Spectroscopic constants of the ground vibrational state of CH₃CHDCN, CH₂DCH₂CN and CH₃CH₂C¹⁵N.
	CH₂DCH₂CN in-plane	CH₂DCH₂CN out-of-plane	CH₃CHDCN	CH₃CH₂C¹⁵N
A /MHz	27651.28641(85)	25022.90806(62)	24449.0602(15)	27541.8853(13)
B /MHz	4425.144021(82)	4583.488572(88)	4661.39671(21)	4574.82824(19)
C /MHz	4000.798104(76)	4110.239468(83)	4155.45941(20)	4119.44781(19)
$\Delta_{J}$ /kHz	2.565394(33)	3.122672(31)	2.839982(82)	2.893555(79)
$\Delta_{_{JK}}$ /kHz	-45.12388(92)	-39.91080(59)	-34.0809(14)	-46.1359(13)
$\Delta_{_K}$ /kHz	551.5425(70)	405.8505(38)	365.720(24)	547.265(14)
$\delta_{_j}$ /Hz	550.855(23)	703.046(20)	656.296(27)	635.249(38)
$\delta_{_k}$ /kHz	10.8468(55)	11.0888(26)	11.6287(44)	12.5398(81)
$\Phi{_J}$ /mHz	7.5447(37)	9.9689(35)	8.4837(98)	8.9909(84)
$\Phi{_{JK}}$ /mHz	-54.29(79)	-34.13(73)	-	-20.9(11)
$\Phi{_{KJ}}$ /Hz	-1.3293(42)	-1.3663(31)	-1.1188(27)	-1.9066(62)
$\Phi{_K}$ /Hz	28.440(21)	18.8395(90)	15.57(10)	30.827(44)
$\phi{_j}$ /mHz	2.8196(28)	3.8411(23)	3.3694(40)	3.4096(49)
$\phi{_{jk}}$ /mHz	78.25(65)	101.06(39)	85.03(74)	103.26(85)
$\phi{_k}$ /Hz	5.618(63)	4.153(46)	4.067(12)	6.561(84)
L_JK /MHz	-	-	-	-6.45(27)
L_KKJ /MHz	38.7(27)	48.04(99)	-	101.5(24)
l_k /MHz	279.(14)	236.7(61)	317.(14)	-

Standard deviation of the fits are given Table 1, see text for more details. Uncertainties given in parenthesis are in units of the last digit given and 1 times the standard deviation.

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