\begin{table}%t1
\caption{\label{meas}Spectroscopic measurements 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 c c c c c}
\hline
\hline
		 \multicolumn{3}{r}{Number of measured lines} & $J$ max & $K_{\rm a}$ max & Standard\\
							    &	8$-$39 GHz	& 150$-$660 GHz &  & & deviation$^a$ (kHz) \\
\hline
CH$_2$DCH$_2$CN in-plane  		& 45	& 415 & 80 & 28 & 27 \\	
CH$_2$DCH$_2$CN out-of-plane	& 58 & 496 & 74 & 29 & 28 \\
CH$_3$CHDCN					& 55 & 222 & 71 & 29 & 57$^b$ \\
CH$_3$CH$_2$C$^{15}$N		& 67 & 270 & 78 & 31 & 64$^b$ \\
\hline
\end{tabular}}
\medskip
$^a$ Calculated from the median of absolute deviations;
 $^b$~for the millimeter wave transitions, the standard deviation of the microwave transitions is 16~kHz.
\end{table}