Automatically Taking Values of a Point on a Graph's Curve - PLEASE HELP

Hi there,

I need to take many values from a graph's line. My current method is hovering over the point on the line and writing the co-ordinates. This is taking far too long.

Does anyone know of a quicker method to extract values of a point on a line? Ideally I could click the point and it automatically log the data.

All help would be appreciated! Any questions or if I haven't been clear, just ask

Thanks!