\begin{table}
\caption {\textbf{Table 1.} Overview of data collected for a cohort of 4,606 articles submitted to the preprint database arXiv between October 4, 2010 and May 2, 2011.}
\begin{tabular}{lrrr}
				&	\textbf{N}				&	\textbf{articles}	&	\textbf{time period}\\				
arXiv downloads	&	2,904,816			&	4,606	&	October 4, 2010 to May 9, 2011\\	
Twitter mentions	&	5,752		&	4,415	&	October 4, 2010 to May 9, 2011\\
early citations		&	431				&	70		&	October 4, 2010 to September 30, 2011\\
\end{tabular}
\end{table}