18 July 2020 4 8K Report

Hello guys,

I encounter such this plot (attached) in the engineering books, but don't know which software the authors used. It is not only about the plot itself because plotting observed X-Y series is not difficult, but I mean how can they use the software to find exactly the coordinates of the interceptions? How can they project vertically or horizontally from a point? And how can they mark or draw whatever they want on the graph? I don't think Excel can do it. 

Looking forward to your answers. Thank you!

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