\begin{table}%t1
\caption{Parameters of the experiments. Unless otherwise specified, the 
experiments were performed with deposition/irradiation at~12~K, and the~{\it hard} UV~spectrum.}
\label{logIR}
%\centerline
{
\begin{tabular}{ccccccccc}   
\hline \hline\\[-3mm]
Exp. & Comment & Ice mixture & Dose & $\frac{{N}_{\rm C}{\rm (HMT)}^1}{{N}_{\rm C}({\rm ice})}$ & $\frac{{N}_{\rm C}{\rm (c.a.~salt)}^2}{{N}_{\rm C}({\rm ice})}$ & $\frac{{N}_{\rm C}{\rm (amide)}^2}{{N}_{\rm C}({\rm ice})}$ & $\frac{{N}_{\rm C}{\rm (ester)}^2}{{N}_{\rm C}({\rm ice})}$ & $\frac{{N}_{\rm C}{\rm (total)}^2}{{N}_{\rm C}({\rm ice})}$ \\ 
OR\#  &         & \tiny{H$_2$O:NH$_3$:CH$_3$OH:CO:CO$_2$} & $\frac{\rm {photon}}{\rm {molec}}$ & (\%) & (\%) & (\%) & (\%) & (\%) \\[1mm]  \hline   
1    & standard exp. & 2:1:1:1:1     & 0.25 & 6.4 $\pm$ 0.3 & 1.8 & 0.33 & 0.16 & 8.7 \\ 
2   & standard exp. & 2:1:1:1:1     & 0.23 & 4.2 $\pm$ 0.1 & 1.1 & 0.32 & 0.07 & 5.7\\ 
3   & standard exp. & 2:1:1:1:1     & 0.26 & 4.4 $\pm$ 0.4$^3$ & 0.6$^3$ & 0.09$^3$ & 0.12$^3$ & 5.2$^3$ \\ 
4    &          & 2:1:1:1:1     & 3.33 & 5.6 $\pm$ 0.1 & 1.5 & 1.2 & 0.9 & 9.2\\ 
5    &          & 2:1:1:1:1     & 0.031 & 2.4 $\pm$ 0.1 & 0.3 & 0.04 & 0.10 & 2.8\\ 
6    & dep. at 80~K & 2:1:1:1:1     & 0.33 & 7.0 $\pm$ 0.2 & 0.9 & 0.53 & 0.15 & 8.6 \\ 
7  & {\it soft} UV spectrum & 2:1:1:1:1     & 0.66 & 7.0 $\pm$ 0.3 & 0.4 & 0.15 & 0.13 & 7.7\\ 
8    & no irradiation & 2:1:1:1:1     & 0 & $\leq$$ 0.1$ & $\leq$$ 0.01$ & $\leq$$ 0.05$ & $\leq$$ 0.05$ & $\leq$$ 0.21$ \\  
9    & & 0:1:1:0:0     & 0.32 & 0.6 $\pm$ 0.1 & 0.09 & 0.27 & 0.05 & 1.0$^4$(1.5)\\ 
10   & & 2:1:0:0:0     & 0.38 & $\leq$$ 0.1^5$ & $\leq$$ 0.01^5$ & $\leq$$ 0.01^5$ & $\leq$$ 0.01^5$ & $\leq$$ 0.13^5$ \\ 
11   & & 2:1:0:1:0     & 0.24 & 0.6 $\pm$ 0.1 & 1.6 & 2.5 & 0.24 & 4.9 \\ 
12   & & 2:1:0:1:1     & 0.26 & $\leq$$ 0.1$ & 0.3 & 0.78 & 0.02 & 1.2\\  
13   & & 2:1:1:0:0     & 0.25 & 0.4 $\pm$ 0.2 & 0.08 & $\leq$$ 0.01$ & $\leq$$ 0.01$ & 0.5$^4$(0.8) \\ 
14   & & 20:1:0:1:0    & 0.15 & 1.3 $\pm$ 0.1 & 0.3 & 1.1 & $\leq$$ 0.01$ & 2.7\\ 
15   & & 20:1:1:0:0    & 0.20 & 17.1 $\pm$ 1.7 & 5.1 & 5.2 & 1.0 & 28.4\\ 
16   & & 20:1:1:1:1    & 0.22 & 15.0 $\pm$ 0.7 & 0.3 & 0.28 & 0.11 & 15.7\\ 
\hline
\end{tabular}}
\medskip
$^1$ Values are the average of the column density values obtained from 
the~1007 and 1236~cm$^{-1}$ features of HMT with band strengths shown in~Table~\ref{strengths}. Errorbars give the difference between both values.  \\
$^2$ Estimated errors obtained by integration using different baselines
are $\leq$20\% of these values. Feature positions are 1586 for~c.a.~salts, 1680 for amides and~1742~cm$^{-1}$ for esters. Band strengths used
for integration are given in Table~\ref{strengths}.  \\
$^3$ For this experiment the last step of the warm-up was slightly 
different. At~298~K the cryostat was switched off as usual, but the heater 
was kept on, set at~298~K, to guarantee the residue was monitored at~constant temperature.   \\
$^4$ In addition to the listed species, the spectrum shows a large 
abundance of~POM-like species. The values in brackets include the~POM~abundances assuming the band strength of pure POM (Table~\ref{strengths}).  \\
$^5$ In this experiment no C-containing ice was deposited, values 
give an upper limit of the carbon column density of the products relative to 
the~total column density of the original ice deposition. 
\end{table}