49/36

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49/36 |-2 -2 0 2>

533.7418 cents

sound sample

49/36, the Arabic lute acute fourth, is composed of two subminor thirds of 7/6, and is the interval between 9/7 and 7/4. It is 540/539 flat of 15/11. Tempering out 540/539 leads to 15-limit swetismic chords such as the tempering of 1-9/7-3/2-7/4.