Murph, it's one of the better charts I've seen. Quite accurate.
I presume the yellow in the color coding represents harmonics (overtones) and the red is the range of fundamental frequencies. The only slight addition I'd make is to extend the lower part of the pipe-organ range to 16 Hz, but that only applies to some pipe organs with really giant low-frequency pipes.

Even the descriptors at the bottom of the chart, "warmth", "honk", etc., are in the correct frequency ranges.

Alan

Alan Lofft,
Axiom Resident Expert (Retired)