I was reading about someone trying to analyse a data series for which they had only a printed graph. They took the trouble to estimate by measurement each point in the data series, so they could build a new graph from the data. A commenter in the discussion thread pointed out that software exists to help automate this process. That sounded like a potentially useful tidbit to note for future reference, so here's the link (just the Wikipedia page on this type of software, but it links to several products for this and includes useful discussion on how to get good results)
http://en.wikipedia.org/wiki/Converting_scanned_graphs_to_data
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