13/9

13/9 |0 -2 0 0 0 1>

636.61766 cents

File:Jid 13 9 pluck adu dr220.mp3 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