\begin{table}%t2
%\centering
\par
\caption{\label{tab:results}The UV destruction cross-sections ($\sigma_{\rm uv}$) and half-lives in the experimental set-up in the laboratory and in the diffuse interstellar environment (DISM), dense clouds (DC) and the Solar System at 1 AU from the Sun (SoSy). Also included in this table is the cyclic hydrogen-bonded trimer of HCN, which is the first photoproduct of s-triazine. Upon continued irradiation, c-(HCN)$_3$ is also photolysed, see Fig.~\ref{fig:triazineproducts}.}
	\begin{tabular}{lccccc}
	\hline\hline
		& $\sigma_{\rm uv}$    & \multicolumn{4}{c}{Half-life} \\
	\cline{3-6}
		& (cm$^2$ molecule$^{-1}$) & lab (s) & DISM (yr) & DC (Myr) & SoSy (min) \\
	\hline
	Pyridine		& $1.2\times10^{-17}$ & 123 & 18  & 1.8  & 32  \\
	Pyrimidine	& $2.7\times10^{-17}$ & 56  & 8.1 & 0.81 & 14  \\
	s-Triazine	& $8.7\times10^{-17}$ & 17  & 2.5 & 0.25 & 4.4 \\
	c-(HCN)$_3$ 	& $2.6\times10^{-17}$ & 57  & 8.3 & 0.83 & 15  \\
	\hline
	\end{tabular}
\end{table}