\begin{table}%t1
%\centering
\par
\caption{Total column-densities (in cm$^{-2}$) of species of interest
with their relative yields. $c$ and~$C$ are the column-densities
across the small and big cloud calculations without turbulent
diffusion.  $c_t$ is for the small cloud when maximum turbulent diffusion is
included with $L=8 \times 10^{-2}$~pc. $C_{\rm t2}$ and $C_{\rm
t10}$ are the results for the big cloud and turbulent diffusion with a
correlation length $L_2=2L$ and $L_{10}=10L$ respectively. The
relative yields are computed as $y=c_{\rm t}/c$, $y_2=C_{\rm t2}/C$
and $y_{10}=C_{\rm t10}/C$. Note that the yields are not strictly 1
for (H$+2$H$_2$), O and C$^+$: this gives an estimate of the mass
conservation error in the code for individual
species. Column-densities as observed in the $\zeta$ Per line of sight
are provided in the last column. The last row diplays the ratio
of H$_2$O to OH column-densities. The last column contains the observed
column-densities as quoted by \cite{LP04}.
\label{table}}
\begin{tabular}{lrrrrrrrrr}
\hline\hline
 Species     & $c$         & $c_{\rm t}$ & $y$       & $C$         & $C_{\rm t2}$& $y_2$      &$C_{\rm t10}$&$y_{10}$      & $\zeta$ Per\\
\hline
    H& 4.6(19)& 7.5(19)& 1.62& 1.1(20)& 1.8(20)& 1.66& 1.8(20)& 1.64& 5.7(20)\\ H$_2$& 2.0(19)& 6.9(18)& 0.34& 3.6(20)& 3.4(20)& 0.93& 3.5(20)& 0.96& 3.7(20)\\ C$^+$& 1.6(16)& 1.6(16)& 1.02& 1.4(17)& 1.5(17)& 1.05& 1.5(17)& 1.07& 1.8(17)\\
    C& 4.3(13)& 1.5(13)& 0.34& 8.1(15)& 4.1(15)& 0.51& 4.6(15)& 0.57& 2.9--3.6(15)\\
    O& 3.7(16)& 3.8(16)& 1.02& 3.6(17)& 3.6(17)& 1.02& 3.7(17)& 1.05& \ldots\\
   CO& 2.7(11)& 2.1(11)& 0.78& 2.3(13)& 9.5(12)& 0.41& 1.5(13)& 0.65& 5.4(14)\\
   OH& 4.8(11)& 2.1(12)& 4.40& 2.0(12)& 1.1(13)& 5.65& 1.7(13)& 8.53& 4.0(13)\\
H$_2$O/OH& 7.9(--2)& 3.6(--2)& \ldots& 8.0(--2)& 9.8(--2)& \ldots& 1.3(--1)& \ldots&\ldots\\
H$_3^+$& 7.5(10)& 9.5(10)& 1.27& 8.7(11)& 3.0(12)& 3.46& 1.5(13)&17.25& 8.0(13)\\
CH$^+$& 7.2(09)& 9.0(10)&12.56& 3.6(10)& 1.8(11)& 5.11& 6.2(11)&17.37& 3.5(12)\\
   CH& 6.1(11)& 4.1(10)& 0.07& 3.9(13)& 1.6(13)& 0.41& 1.8(13)& 0.46& 1.9--2.0(13)\\
H$_2$O& 3.8(10)& 7.6(10)& 2.00& 1.6(11)& 1.1(12)& 6.89& 2.1(12)&13.33& \ldots\\  
\hline
\end{tabular}
\end{table}