\begin{table}%ta.2
%\centering
\par
\caption{\label{table:result-water_a}Column density $N_{\rm A}$ of water ice along the line of sight to the observer (Eq.~(\ref{eq:column-density})).}
\begin{tabular}{lccccccc} 
\hline\hline \noalign{\smallskip}
Exposure & $PA$ [$^{\circ}$] & $N_{\rm A}$ [$10^{22}$ m$^{-2}$] &
$A_{\rm V}$ [mag] & $m_{\rm a;s}$ [\%] & $m_{\rm a;l}$ [\%] & $m_{\rm c}$ [\%] &  $\chi$ \\
\hline
Elia~2-23 (p) & $53$ & $0.52$ & $7$ & -- & -- & -- & -- \\
Elia~2-23 (o) & $45$ & $0.26$ & $5$ & $100$ & -- & --  & $0.04$ \\ 
Elia~2-21 (p) & $53$ & $0.66$ & $9$ & -- & -- & -- & -- \\ 
GY92~244 (p) & $178$ &  $1.8$ & $20$ & $>$99 & $<$1 & $<$1  &$0.08$ \\ 
 GY92~244 (o) & $88$ &  $2.1$ & $23$ & $>$99 & --  &  $<$1 & $0.1$\\
        CRBR~2422.8-3423 (p) & $53$ & $3$ & $35.1$ & -- & -- & --  & -- \\
        CRBR~2422.8-3423 (o) & $45$ & $3$ & $29.1$ & $91$ & $<$1  & $8$  &
        $0.2$ \\ 
        VV~CrA~B (p) & $134$ & $0.66$ & $9$ & $>$99 & -- & $<$1 & $0.05$
        \\       
        VV~CrA~A (p) & $134$ & $0.13$ & $3$ & -- & -- & -- & -- \\
        VV~CrA~A (o) & $43$ & $0.030$ & $2$ & -- & -- & -- & -- \\
        \hline
      \end{tabular}
  \end{table}