How to read out the scale values of an intensity graph?

[sinnfrei]

My aim is to read OUT the scale ranges (Max and min values DISPLAYED) of an intensity graph.

I want to do a scan of an area, display the result in the graph, graphically zoom in on something interesting and then use the zoom coordinates to define the area for the next scan.

Is that possible, and how?

If impossible, is there a work-around?

[BFeigum · Accepted solution]

Use the "XScale.Range" and "YScale.Range" property nodes. 

[sinnfrei]

Thanks. After I figured out how to make property nodes, it worked beautifully.