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I want to change the values on a graph, but I don't have the initial data, means I have just the graph. Any idea?

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You don't have the source data for a graph? How is the graph drawn then? Changing the limits of x & y axes can be done by clicking on the axis ... Format Axis / and then modifying them in Axis options category. – Rook Jan 20 '13 at 0:36
    
Yes its merely a picture, I don't have the data. When I go to format axis, it doesn't allow me to type the values I want. – Marina Jan 20 '13 at 20:34

If you have the image as a graphic file (.JPG, .PNG, .GIF, etc.) or a hardcopy that you could scan to produce a graphic file, there is a wide variety of graph digitising software packages that you could use to retrieve the original data points, which you could then re-plot any way you liked.

There is a Wikipedia article that provides references to a number of packages, another list of software alternatives for the same task and a CNET review of still another package that carries out this task.

Of the various packages that I've used over time to do this, the one I used most recently was WinDig though it is getting pretty old -- it is still a 16-bit Windows application -- so I wouldn't necessarily recommend that one.

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