Septimal diesis
In music, septimal diesis (or slendro diesis) is an interval with the ratio of 49:48 ⓘ, which is the difference between the septimal whole tone and the septimal minor third. It is about 35.7 cents wide, which is narrower than a quarter-tone but wider than the septimal comma. It may also be the ratio 36:35, or 48.77 cents. ⓘ
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