deletions | additions       diff --git a/Results_exploratory_analysis.tex b/Results_exploratory_analysis.tex  index 18bcd5d..0586fb9 100644  --- a/Results_exploratory_analysis.tex  +++ b/Results_exploratory_analysis.tex 
...
the same every year. The graph shows that with widespread use and  adoption of the WWW, linking to online resources within published  articles has become more and more popular. The bars in the barplot of Figure  \ref{fig:barplot} \ref{fig:fig1}  also depict whether published links are still available as of December 2011: the green portion of each bar represents  the volume of valid links (HTTP status code 200: OK), while the grey  portion of the bars represents broken links (HTTP status codes 3xx, 
...
years later.  This analysis can be pushed further by exploring two distinct subsets  of the astronomy link corpus. In Figure \ref{fig:lines} \ref{fig:fig2}  we show how the percentages of broken links differ over time for a set of $1801$ links to personal  websites (links which contain the tilde symbol \~ , which  are usually reserved for personal web pages on institutional servers) 
...
pointers to established archives and repositories, managed and curated  by institutions, surveys, telescope sites. Authors may want to link to  these resources to cite and acknowledge the raw data sources that they employed in  their research. Figure \ref{fig:lines} \ref{fig:fig2}  shows that the availability of these two categories of links follow very different, yet expected,  patterns. The vast majority of ``tilde links'' published between 1997  and 2003 is not available any more (personal links are depicted as