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\begin{table}  \caption{\label{data_specs} \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{center}  \begin{tabular}{||c|ccc||}  \hline\hline \begin{tabular}{llll}  & N & articles & time period \\\hline \\  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 \\\hline \\  \end{tabular}  \end{center}  \end{table}