\documentclass[12pt,a4paper]{article}
\begin{document}
\begin{table}[ht]
\begin{center}
\caption{All statistics are based on contigs of size $\geq$ 500 bp, unless otherwise noted (e.g., "\# contigs ($\geq$ 0 bp)" and "Total length ($\geq$ 0 bp)" include all contigs).}
\begin{tabular}{|l*{2}{|r}|}
\hline
Assembly & SOAPdenovo2.scafSeq & SOAPdenovo2.scafSeq\_broken \\ \hline
\# contigs ($\geq$ 0 bp) & 460832 & - \\ \hline
\# contigs ($\geq$ 1000 bp) & 52963 & 42521 \\ \hline
\# contigs ($\geq$ 5000 bp) & 15310 & 2650 \\ \hline
\# contigs ($\geq$ 10000 bp) & 4029 & 754 \\ \hline
\# contigs ($\geq$ 25000 bp) & 348 & 78 \\ \hline
\# contigs ($\geq$ 50000 bp) & 65 & 11 \\ \hline
Total length ($\geq$ 0 bp) & {\bf 341557143} & - \\ \hline
Total length ($\geq$ 1000 bp) & {\bf 238700704} & 94617133 \\ \hline
Total length ($\geq$ 5000 bp) & {\bf 142785220} & 25694191 \\ \hline
Total length ($\geq$ 10000 bp) & {\bf 65449439} & 12909605 \\ \hline
Total length ($\geq$ 25000 bp) & {\bf 13809407} & 2960585 \\ \hline
Total length ($\geq$ 50000 bp) & {\bf 4528785} & 745412 \\ \hline
\# contigs & 81683 & 122248 \\ \hline
Largest contig & {\bf 131125} & 110960 \\ \hline
Total length & {\bf 258047143} & 149486868 \\ \hline
GC (\%) & 54.98 & 55.25 \\ \hline
N50 & {\bf 5616} & 1346 \\ \hline
N75 & {\bf 2807} & 793 \\ \hline
L50 & {\bf 12713} & 25253 \\ \hline
L75 & {\bf 28913} & 62248 \\ \hline
\# N's per 100 kbp & 31576.15 & {\bf 27.95} \\ \hline
\end{tabular}
\end{center}
\end{table}
\end{document}
