Hi, I have a problem with a 2D graph and a fit line. I want to fit a line to one point on the chart that will reach the next horizontal straight line. The point at which the line is fitted is to be a straight vertical line to the horizontal chart. I am asking for help because I do not know how to do it. Finally, calculate the distance on the horizontal graph between one point and the other. I enclose a photo as if someone did not understand what's going on.