\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 & contigs\_1 & contigs\_2 \\ \hline
\# contigs ($\geq$ 0 bp) & 3 & 4 \\ \hline
\# contigs ($\geq$ 1000 bp) & 3 & 2 \\ \hline
\# contigs ($\geq$ 5000 bp) & 0 & 0 \\ \hline
\# contigs ($\geq$ 10000 bp) & 0 & 0 \\ \hline
\# contigs ($\geq$ 25000 bp) & 0 & 0 \\ \hline
\# contigs ($\geq$ 50000 bp) & 0 & 0 \\ \hline
Total length ($\geq$ 0 bp) & {\bf 6710} & 5870 \\ \hline
Total length ($\geq$ 1000 bp) & {\bf 6710} & 5460 \\ \hline
Total length ($\geq$ 5000 bp) & 0 & 0 \\ \hline
Total length ($\geq$ 10000 bp) & 0 & 0 \\ \hline
Total length ($\geq$ 25000 bp) & 0 & 0 \\ \hline
Total length ($\geq$ 50000 bp) & 0 & 0 \\ \hline
\# contigs & 3 & 2 \\ \hline
Largest contig & {\bf 3980} & 3360 \\ \hline
Total length & {\bf 6710} & 5460 \\ \hline
Reference length & 10000 & 10000 \\ \hline
GC (\%) & 51.28 & 52.44 \\ \hline
Reference GC (\%) & 52.07 & 52.07 \\ \hline
N50 & {\bf 3980} & 3360 \\ \hline
NG50 & 1610 & {\bf 2100} \\ \hline
N90 & 1120 & {\bf 2100} \\ \hline
NG90 & - & - \\ \hline
auN & {\bf 2934.0} & 2875.4 \\ \hline
auNG & {\bf 1968.7} & 1570.0 \\ \hline
L50 & 1 & 1 \\ \hline
LG50 & 2 & 2 \\ \hline
L90 & 3 & {\bf 2} \\ \hline
LG90 & - & - \\ \hline
\# misassemblies & {\bf 1} & 2 \\ \hline
\# misassembled contigs & 1 & 1 \\ \hline
Misassembled contigs length & 3980 & {\bf 3360} \\ \hline
\# local misassemblies & 0 & 0 \\ \hline
\# scaffold gap ext. mis. & 0 & 0 \\ \hline
\# scaffold gap loc. mis. & 0 & 0 \\ \hline
\# unaligned mis. contigs & 0 & 0 \\ \hline
\# unaligned contigs & 0 + 0 part & 0 + 0 part \\ \hline
Unaligned length & 0 & 0 \\ \hline
Genome fraction (\%) & {\bf 67.100} & 54.600 \\ \hline
Duplication ratio & 1.000 & 1.000 \\ \hline
\# N's per 100 kbp & 0.00 & 0.00 \\ \hline
\# mismatches per 100 kbp & 0.00 & 0.00 \\ \hline
\# indels per 100 kbp & 0.00 & 0.00 \\ \hline
\# genomic features & {\bf 5 + 4 part} & 1 + 6 part \\ \hline
\# operons & {\bf 1 + 1 part} & 0 + 2 part \\ \hline
\# predicted genes (unique) & {\bf 7} & 6 \\ \hline
\# predicted genes ($\geq$ 0 bp) & {\bf 6 + 1 part} & 5 + 1 part \\ \hline
\# predicted genes ($\geq$ 300 bp) & {\bf 5 + 1 part} & 4 + 1 part \\ \hline
\# predicted genes ($\geq$ 1500 bp) & 1 + 0 part & 1 + 0 part \\ \hline
\# predicted genes ($\geq$ 3000 bp) & 0 + 0 part & 0 + 0 part \\ \hline
Largest alignment & 2030 & {\bf 2100} \\ \hline
Total aligned length & {\bf 6710} & 5459 \\ \hline
NA50 & {\bf 1950} & 1471 \\ \hline
NGA50 & {\bf 1610} & 700 \\ \hline
NA90 & {\bf 1120} & 700 \\ \hline
NGA90 & - & - \\ \hline
auNA & {\bf 1754.1} & 1552.2 \\ \hline
auNGA & {\bf 1177.0} & 847.5 \\ \hline
LA50 & 2 & 2 \\ \hline
LGA50 & {\bf 3} & 4 \\ \hline
LA90 & 4 & 4 \\ \hline
LGA90 & - & - \\ \hline
\end{tabular}
\end{center}
\end{table}
\end{document}