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. 2008 Jun 11;5(29):1429–1434. doi: 10.1098/rsif.2008.0143

Figure 1.

Figure 1

Intervals within an octave. The related frequency ratio is marked below each interval and their ordering of perfection is numbered above each interval in Roman numerals. For simplicity, the intervals are shown relative to C4 (264 Hz) but can be achieved for any other reference note.