\begin{table}%t1
\caption{\label{positions}Observed NIR methane phase II and clathrate hydrate lines.}
%\centerline
{
\small\begin{tabular}{l cc}
\hline\hline\noalign{\smallskip}
& CH$_4$ II (5.6~K)\tablefootmark{a}    &Clathrate (5.6~K)
\\
Dominant transitions	&
$\bar{\nu}$ (cm$^{-1}$)\tablefootmark{b}	     &
$\bar{\nu}$ (cm$^{-1}$)\tablefootmark{b}		
\\
\hline
$3\nu_4$				&3826.1			&3837.0	
\\
&3843.2			&3842.0	
\\
	&3847.9			&3847.0	\\
	&3849.8			&(3855.2)	\\
	&3851.8			&	\\
$\nu_2+2\nu_4$		&4113.6			&4119.7	\\
	&4120.0			&\\
$\nu_1+\nu_4$			&4201.8			&4188.2	\\
	&4206.3			&4192.8	\\
	&				&4197.4	\\
	&				&4200.9~sh\\
	&				&4206.8	\\
	&				&4210.8	\\
$\nu_3+\nu_4$			&4283.1			&4283.9	\\
	&4300.4			&4290.3	\\
	&4308.0			&4296.1~sh	\\
	&4314.5			&4302.5\\
	&4323.7			&4311.9	\\
	&4327.6			&4317.9~sh	\\
	&				&4323.9	
\\
&				&4332.0~br	\\
$\nu_2+\nu_3$			&4527.5			&4506.6	\\
				&4537.4			&4515.7	\\
				&4546.5			&4525.0	\\
					&				&4533.3	\\
				&				&4540.0	\\
$\nu_3+2\nu_4$		&5565.5			&5545.1	\\
	&5573.6			&5553.2	\\
	&5586.1			&5560.5\\
$2\nu_2+2\nu_4$		&5594.9			&5594.3	\\
	&5611.5			&5605.4	\\
	&5631.2			&\\
$\nu_2+\nu_3+\nu_4$	&5800.3			&5782.9	\\
				&5807.1			&5792.0	\\
$2\nu_3$				&5986.1			&5959.7	\\
	&6000.3			&5968.6	\\
				&			&5977.4	\\
				&		&(5988.9)	\\
				&			&(5997.3)	\\
\hline
\end{tabular}}
\tablefoot{\tablefoottext{a}
{This work, based on the analysis presented in Baciocco et~al. (\cite{Baciocco1987}), Khanna \& Ngoh (\cite{Khanna1990}), Calvani et~al. (\cite{Calvani1992});}
\tablefoottext{b}{the position typical accuracy is estimated to be better than 0.5~cm$^{-1}$; lines in parenthesis are tentative detections}}
\end{table}