Think you have been given a chart including set of curves which was drawn according to a scale and is as a pdf or jpeg file. Then you will have to get the coordinates of each curves. How do you get the coordinates (x,y) of each curves? Below software will be help us to do the job done without any difficulty.

[embedyt] https://www.youtube.com/watch?v=qHyJT0q5tK0[/embedyt]