Finding starting point of chart plot area

Hello rweatherly,

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Sincerely,
Leith Ross

Thanks Andy, but I also want to add some text boxes associated with the lines, so the location is important. I will post an example, but here is a brief explanation:

The chart plots river level on the Y axis against river mile on the X axis. Landmarks at various river miles need to be added to make the chart easier to understand. (River miles are the distance along the winding river measured upstream from the point that the river discharges into ocean, lake or the next river)

See attached sample chart.