\begin{table}%t2
%
\par
\setlength\tabcolsep{17pt}
\caption{\label{Tab:spatial_dimensions}Measured radial and axial dimensions of the NK1 and SK1~knots.}
%\centering
\small
\begin{tabular}{lcc}
\hline\hline
&& \\[-8pt]
Dimensions                       			& \multicolumn{2}{c}{Values [10$^{15}$ cm]} 	 \\
\hline
\noalign{\smallskip}
NK1      						&   			&				\\
({\it r}1, {\it z}1)					&   	1.87		&	4.44    		\\
({\it r}2, {\it z}2)					&   	2.18		&	5.92    		\\
({\it r}3, {\it z}3)					&   	2.95		&	8.15    		\\
({\it r}4, {\it z}4)					&   	2.93		&	10.0    		\\
{\it z$_{\rm max}$}					&   	\multicolumn{2}{c}{15}    		\\
\hline
\noalign{\smallskip}
SK1      						&   			&				\\
({\it r}, {\it z})					&   	2.08		&	3.70    		\\
{\it z$_{\rm max}$}					&   	\multicolumn{2}{c}{5.5}    		\\
\hline
\end{tabular}
\end{table}