Here is a graph from Melvin Miles that I re-plotted using this online program: https://automeris.io/WebPlotDigitizer/
Using this program is tedious, but the graph sure looks better.
Original:
New version:
It is tedious because with a low quality image like this one, after you add the points automatically, you then have to adjust them, add them, delete them and shuffle them around, like these points from the right end of the graph: