deletions | additions       diff --git a/materials_and_methods.tex b/materials_and_methods.tex  index 13297b2..bbc0a4c 100644  --- a/materials_and_methods.tex  +++ b/materials_and_methods.tex 
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performed the following filtering workflow. First, we removed links to  domains that are scholarly repositories and which obviously do not  host data (or which did not host data prior to 2008). These include  domains such as \url{http://dx.doi.org}, \url{http://arxiv.org}, \url{http://xxx.lanl.gov}, \href{http://dx.doi.org}{dx.doi.org}, \href{http://arxiv.org}{arxiv.org}, \href{http://xxx.lanl.gov}{xxx.lanl.gov},  and \url{http://adsabs.harvard.edu}. \href{http://adsabs.harvard.edu}{adsabs.harvard.edu}.  Removing links to these domains, which are obviously pointers to articles, narrowed down the corpus to  $26663$.