7/6 |-1 -1 0 1>
266.87091 cents
https://en.xen.wiki/w/File:Jid_7_6_pluck_adu_dr220.mp3 sound sample
In 7-limit Just Intonation, 7:6 is the septimal minor third. At about 267 cents, it is smaller than both the 5-limit minor third (6/5, ~316 cents) and the familiar 12edo minor third (300 cents).
http://en.wikipedia.org/wiki/Septimal_minor_third