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648/625 |3 4 -4>

62.5651 cents

sound sample

The interval 648/625 (about 62.6 cents) is known as the diminished comma or major diesis, and is the amount by which four 6/5 minor thirds exceed an octave, in other words (6/5)^4 / 2. Tempering it out leads to 5-limit diminished temperament. This is approximately one step of 19edo, which is the amount by which four 19edo minor thirds exceed an octave.