\begin{table}%t2
\caption{\label{paramA}Spectroscopic constants of the ground vibrational state of CH$_3$CHDCN, CH$_2$DCH$_2$CN and CH$_3$CH$_2$C$^{15}$N.}
\small%\centerline
 {
\begin{tabular}{ l r r r r}
\hline
\hline
\multicolumn{1}{c}{} & \multicolumn{1}{c}{CH$_2$DCH$_2$CN in-plane}  &  \multicolumn{1}{c}{CH$_2$DCH$_2$CN out-of-plane} & \multicolumn{1}{c}{CH$_3$CHDCN}  &  \multicolumn{1}{c}{CH$_3$CH$_2$C$^{15}$N}\\
\hline
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)    &      	 --            	 \\
\hline
\end{tabular}}
\medskip
Standard deviation of the fits are given Table~\ref{meas}, see text for more details. Uncertainties given in parenthesis are in units of the last digit given and 1~times the standard deviation. 
\end{table}