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these resources to cite and acknowledge the raw data sources that they employed in  their research. Figure \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  a black solid line and circles). Astronomers change locations, jobs,  institutions and, as such, their personal web servers change or expire  over time. However, the percentage of broken links to personal  websites falls rapidly: nearly all ``tilde links'' published in 2008  are still accessible today. A different scenario emerges when one looks at the temporal pattern for links to curated archives  (depicted in the graph as a red line and crosses): the percentage of  broken links stays roughly the same over time (between 15\% and