\begin{table}%t5
\caption{Spatial distribution of different types of stars in the
four chips of the South field. The Pre-Main Sequence stars included
here are only those that can be identified individually, \ie those
with $(m_{F675W}-m_{F656N})>0.5$. For typographical
convenience we report the Poissonian uncertainty as the square root of
the observed number of stars in each bin. \label{tab:south_space}}
%\centerline
{\begin{tabular}[b]{*{4}{c}}\hline\hline
Chip & Massive stars   & PMS       & Red Clump    \\ \hline
{PC}  & $2\pm1.4$  & $6\pm2.4$      & $25\pm5$      \\
(PC$\rightarrow$WF$^{a}$ & $9.7\pm6.8$ & $28.8\pm11.8$ & $121\pm24$)\\
{WF2} & $24\pm4.9$ & $100\pm10$   & $63\pm7.9$    \\
{WF3} & $29\pm5.4$ & $137\pm11.7$   & $61\pm7.8$    \\
{WF4} & $9\pm3$    & $123\pm11.1$   & $51\pm7.1$    \\ \hline
Total     & $64\pm8$   & $366\pm19.1$ & $200\pm14.1$  \\
(Total$\rightarrow$WF$^{b}$ & $19.9\pm2.5$ & $114.4\pm6.0$ & $62.3\pm4.4$)\\
\hline
\end{tabular}}
\par
\smallskip
$^a$ Detections in the PC per unit WF area, \ie 4.8 times larger.\\
$^b$ Total detections per unit WF area, \ie 3.2
times smaller than the entire field. 
\par
\end{table}