\begin{table}%T2
%\centering
\par
\caption{Differential number counts, $N$, and surface density, $n$ (in
  arcmin$^{-2}$), of Lyman-break galaxies in the CFDF fields, for a
  range of $I_{AB}$-selected slices. The mean surface density,
  labelled CFDF, is also given.  Errors in the surface density
  measurements for each individual field are computed using Poisson
  counting statistics; field--to--field variance is used to estimate
  the error in the mean.}
\label{tab:samplim}
\begin{tabular}{{c}*{3}{cp{1cm}}c}\hline\hline
 & \multicolumn{2}{c}{{\bfseries 0300+00}} &
 \multicolumn{2}{c}{{\bfseries 1415+52}} &
 \multicolumn{2}{c}{{\bfseries 2215+00}} & {\bfseries CFDF} \\
 & \multicolumn{2}{c}{{\bfseries\scriptsize{$A=646~$arcmin$^2$}}}
 & \multicolumn{2}{c}{{\bfseries\scriptsize{$A=708~$arcmin$^2$}}}
 & \multicolumn{2}{c}{{\bfseries\scriptsize{$A=317~$arcmin$^2$}}} &\\
\hline
magnitude range & $n$ & $(N)$ & $n$ & $(N)$ & $n$ & $(N)$ & $n$ \\
($I_{AB}$) & & & & & & & \\
\hline
20.0--22.5 & 0.003$~\pm~$0.003 & (2) & 0.010$~\pm~$0.004 & (7) & 0.006$~\pm~$0.006 & (2) & 0.006$~\pm~$0.004 
\\
22.5--23.0 & 0.020$~\pm~$0.006 & (12) & 0.008$~\pm~$0.004 & (6) & 0.013$~\pm~$0.008 & (4)  & 
0.014$~\pm~$0.006 \\
23.0--23.5 & 0.08$~\pm~$0.01 & (55) & 0.05$~\pm~$0.01 & (36) & 0.07$~\pm~$0.02 & (22)  & 0.07$~\pm~$0.02 \\
23.5--24.0 & 0.31$~\pm~$0.02 & (200) & 0.16$~\pm~$0.02 & (116) & 0.22$~\pm~$0.03 & (69)  & 0.23$~\pm~$0.08 
\\
24.0--24.5 & 0.59$~\pm~$0.03 & (379) & 0.34$~\pm~$0.02 & (242) & 0.45$~\pm~$0.04 & (142)  & 0.46$~\pm~$0.13 
\\
\hline
\end{tabular}
\end{table}