\begin{table}%t2
%\centering
\par
\caption{Peak identification of the gas chromatogram (corresponding to Exp.~4, 
Table~\ref{logGC}) shown in Fig.~\ref{chro}.}
\label{chroHMT}
\begin{tabular}{ccccc}   \hline \hline
Peak label    & Integ. area  & Separation time & Molecular ion mass   & Assigned carrier \\ 
              & (relat. to HMT) &       s    & amu &   \\  \hline 
1             & 100             & 1020           & 140    & HMT \\ %17:00  
2             & 0.07            & 1078           & 154    & HMT--CH$_3$ \\%17:58
3             & 0.25            & 1286           & 156    & HMT--OH \\ %21:26
4             & 0.03            & 1485           & 170    & HMT--CH$_2$OH \\%24:45
5             & 0.04            & 1690           & 183    & HMT--NH--CHO \\%28:10
Exp.~1        & 0.04            & 3729           & 198    & CH$_2$OH--HMT--CHO/HMT--CHOH--CHO \\%62:09
\hline
\end{tabular}
\end{table}