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13/9
|0 -2 0 0 0 1>
636.61766 cents
sound sample

In 13-limit Just Intonation, 13/9 is a high tritone measuring about 636.6¢. Its inversion is 18/13, a low tritone. It appears between the 9th and 13th overtones of the harmonic series.

See: Gallery of Just Intervals