deletions | additions       diff --git a/Results_exploratory_analysis.tex b/Results_exploratory_analysis.tex  index 7df377b..18bcd5d 100644  --- a/Results_exploratory_analysis.tex  +++ b/Results_exploratory_analysis.tex 
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potential data links are selected and filtered is  described in the Materials and Methods section.  In the barplot of Figure \ref{fig:barplot} \ref{fig:fig1}  we show how linking practices have changed over  time. Links to potential data resources in astronomy first appear in  1997, with only a couple of dozens links published in that year, and