Instructions:

1. Upload an image file via "Choose File"
2. Choose four reference points from axes:
   • Place mouse at given point
   • Press '1' for x₁, '2' for x₂, '3' for y₁, and '4' for y₂
   • Input values for x₁, x₂, y₁, y₂ under 'Axis Definitions'
3. Now that the scales have been set points can be added:
   • Simply click on any location on plot to add point to collection
   • Alternatively, place cursor on plot and hit 'enter'
   • Once cursor is on plot arrow keys can be used for better accuracy
   • Use '+' and '-' to adjust zoom
4. Use 'Create text file' to export values

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