Connect two related data points in chart

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I would like to connect two responses, initial and final, with a vertical line for each run. If possible, I would also likw to display the difference value near the line. I have attached a picture of my graph and an example of what I would like to do in the second picture (found on the web, but done in a different software package).

karrun100_0-1634912383346.png

 

 
 

karrun100_3-1634912460966.png

 

 

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