matplotlib graph (.png image) modification post-creation

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There's no way of easily changing PNG files; they're just flat images. You can always edit them with a raster image editor such as GIMP or Photoshop, but it's non-trivial to do things like change the axis labels.

If you have the source code that generated these images it's easy to change these things. If you want a more easily editable format for the future try SVG.