Take the highest resolution version of the graph that you can find.
Import it into a vector editing program such as coreldraw or adobe illustrator.
Using the graph as a background image, trace things.
Create an x and y axis with a line tool.
Very precisely draw rectangles to match the graph with each rectangle snapped to the x axis line. Once you recreated the graph in a vector editing program, drag the background image off to the side of the work area.
Now group all the vectors you have created except for the x axis and y axis.
Create one last rectangle on top of the y axis that goes up to the 70/200 axis line. Duplicate the rectangle. Drag the duplicate off to the side. Group the other y axis intersecting rectangle with the previous group.
Go to he rectangle that you dragged off to the side... The duplicate one. Resize he vertical dimension of that rectangle until it is 70. The units dont matter... Inches, cm, mm... Whatever.
Now take your big group and resize the vertical dimension of that group until the vertical dimension of the other y axis intersecting rectangle is exactly the same height as your "70 rectangle".
You are now done... Ungroup,all and check the height of each individual rectangle. Your results will be approximate only.
I could have done this 20x faster than it took me to write this confusing and probably very bad tutorial. I will do it for you for $150 LOL
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