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What does the Y-Axis and X-Axis represent on the Harmonics Chart of an ION Meter?

Issue
What does the Harmonics Chart numbers represent with an ION Meter?

Product Line
PowerLogic ION7400, ION9000 and PM8000 Meter Series

Environment
ION Meter front display or webpage for Power Quality, Harmonics Chart.

Resolution
X-axis is Harmonic number, 2 is second harmonic, 3 is third harmonic etc.
Y-axis is Engineering units (Volts or Amps), you can show this by changing the PT or CT ratio.
If the fundamental harmonic (H1) is displayed, the other harmonic measurements would be too small to show any significant data. 35V of 4160V is ~0.8% of fundamental.

ION Meter Power Quality Harmonics Chart Y-Axis X-Axis