\begin{table}%t2
\par
\caption{\label{tab:tabices}Grain mantle compositions.}
%\centerline
 {\begin{tabular}{llllllllll}
\hline
\hline%\\[-3mm]
Species$^{a}$& \object{Elias 16}$^{b}$& \object{Elias 29}$^{c}$ & Class \rm{I}/\rm{II} Objects$^{d}$ & Model &$t = 0.0$ &$t = 0.5$ $t_{{\rm ff}}$ &$t = 1.5$ $t_{{\rm ff}}$ &$t = 2.5$ $t_{{\rm ff}}$ & Midplane disk$^{e}$\\
\hline%\\[-3mm]
\rm{H$_{2}$O}$^{f}$
       & $100$ & 100 & 100&\rm{S} & $1.55(-4)$ & $1.65(-4)$ & $1.71(-4)$& $1.71(-4)$&$1.8(-4)$\\
       &              &         &    &\rm{G} &  {\it 1.24(--5)}  & {\it 8.29(--6)} & {\it 4.5(--6)} &{\it 4.2(--6)}  & {\it 1.4(--5)}$^{g}$    \\
\rm{CO} & $25$ & 5.6 & \ldots &\rm{S} &13.9 & 17.0 & 11.6 & 5.0 & 17.6\\
               &            &        &   & \rm{G} &71.6&  61.1&  31.4 &13.5  &77.5\\
\rm{CO$_{2}$}      & $24$& 22 & $\sim $12 &\rm{S}&46.9 &40.6&31.0&29.8&37.7\\
                                &           &       &                   &\rm{G}& 3.6(--1) & 3.1(--1)& 2.2(--1) &  2.2(--1) &4.2(--1)\\
\rm{CH$_{3}$OH}       & $<$2.3 & $<$4.4 & $\ga$2--9 &\rm{S}&8.7&7.0&6.6&6.7&2.2 \\
                                        &               &                &              &\rm{G} & 1.4(--5) &  2.1(--5) & 2.9(--5) & 2.9(--5) & 7.0(--8)   \\ 
\rm{NH$_{3}$} & $\leq $8 & $< $9.2 & $\la $14 &\rm{S}&$9.8(-1)$&$3.3(-1)$&$2.6(-1)$&$3.4(-2)$&$4.0(-1)$\\ 
                            &                &                &                           &\rm{G} & 1.7(--2) &   1.1(--2) &  2.7(--3) &  1.0(--3)  & 6.0(--3)           \\  
\rm{CH$_{4}$}       &  $<$3 & $<$1.6 & $\sim$4&\rm{S} & $1.1(-1)$&$1.7(-1)$&$1.4(-1)$&$1.0(-1)$&1.8\\
                                  &           &               &                  &\rm{G} &  2.2 &    2.0&    1.6 &  1.4  & 1.0 \\ 
\rm{H$_{2}$CO}& \ldots & $<$1.8& $\sim$2&\rm{S}&1.1&1.6&3.9&4.1&2.9\\
                             &             &             &                 &\rm{G} &  4.5(--4)  &   3.7(--4) &  4.3(--4) & 4.7(--4) &4.8(--4)  \\
\rm{OCS}&  $< $0.2 & 
$<$0.05&\ldots&\rm{S}&$4.3(-9)$&$4.9(-10)$&$4.6(-10)$&$8.1(-10)$&$0$\\
                &                 &                  &   &    \rm{G}  &3.7(--3)    &       4.0(--3) &    3.0(--3) &    2.7(--3)  &9.1(--2)       \\
\rm{HCOOH}&  \ldots& $< $0.9& $\sim$0.6&\rm{S}&$1.5$&$2.6(-2)$&$1.4(-2)$&$1.4(-2)$&$3.4(-2)$\\
                     &      &              &                   &  \rm{G} & 7.7(--3)  &  9.3(--3) &    7.7(--3) &  7.1(--3) &  6.9(--1) \\
\rm{SO$_{2}$}& \ldots& \ldots& $\sim $0.5&\rm{S}&$2.3(-2)$&$1.3(-2)$&$8.7(-3)$&$8.4(-3)$&$1.2(-2)$\\
                          &     &   &                    &\rm{G} &      7.8(--4)   &    1.0(--3)  &    7.0(--4)   &   5.9(--4)  &   8.3(--3)  \\
\hline
\end{tabular}}
\par
 \smallskip
Observed ice compositions as percentage of the \rm{H$_{2}$O} abundance compared with model results. Every first line for a species shows the results from Model \rm{S} (includes surface reactions) and the second line shows the results for Model \rm{G} (excludes surface reactions).
$^{a}$ Abundances are given as $a(b) = a \times 10^{b}$.
$^{b}$ \rm{CO} \cite{1995ApJ...455..234C}; \rm{CO$_{2}$}, \rm{CH$_{3}$OH}, \rm{NH$_{3}$}, and \rm{CH$_{4}$} \cite{2005ApJ...635L.145K}; \rm{OCS} \cite{1997ApJ...479..839P}.
$^{c}$ \cite{2000IAUS..197..135E} and \cite{2004ASPC..309..547B}. 
$^{d}$ \cite{2007arXiv0712.2458Z}.
$^{e}$ At $t = 2.5$ $t_{{\rm ff}}$ and a radius of $\sim$500~AU.
$^{f}$ \rm{H$_{2}$O} fractional abundance are given for the simulation: $n({\rm H}_{2}{\rm O})/n({\rm H}_2)$.
$^{g}$ For model~\rm{G} we have taken an \rm{H$_{2}$O} fractional abundance of $1.8 \times 10^{-4}$ for calculating the ice fraction of other species, instead of the reported values on this line.
\end{table}