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I still don't know what you mean by upper and lower stack, is this a graphing term I should be familiar with? Do you mean two separate Y scales? Cause that can be done as well with one on the left and one on the right. This was also why I asked for a picture since I wasn't sure what you were talking about. Glad you seem to have something working or close to it.

If I understand you right you want this. Here I did it with a Waveform Graph, but it could be done with XY, and probably a chart. Graph Test.vi

I don't think what you are asking is too difficult, but I'd rather see a picture of what you are trying to accomplish. So I understand where the 6 lines come from, A Minimum, Maximum, and Value for two separate measurements. But what are the 2 stacks? I think this can be done pretty easily with an XY graph but I might be misunderstanding your needs. Also keep in mind that the XY graph also has the ability to place static images on top, or behind graphs using the Plot Images property node. With this you should be able to also overlay anything you might want on the graph that isn't immediately respectable with XY data.

If python-like indexing is implied, the OP is probably wrong. $ python Python 2.7.6 (default, Jun 22 2015, 17:58:13) [GCC 4.8.2] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> a=[7,6,5,4,3,2,1] >>> a[2:] [5, 4, 3, 2, 1] >>> a[:3] [7, 6, 5] >>> a[-1] 1 >>> a[4] 3 >>> a[-4:-2] [4, 3] https://docs.python.org/3/tutorial/introduction.html#lists https://docs.python.org/3/tutorial/introduction.html#strings