Sometimes
it is necessary to extract data values from graphs, e.g. in most
scientific publications only plots but no data values are published.
DigitizeIt makes it easy to actually get back numbers from such a
plot! This is a three step process: a) import the graph from a file
or copy it over the clipboard, b) define the axes system, c) digitize
it automatically or manually. Data values can then be saved in ASCII
format or copy & pasted directly into any other application, e.g.
MS Excel or Microcal Origin.
Source: Link
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