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60/49 |2 1 1 -2>

350.6169 cents

sound sample

60/49, the smaller septimal neutral third, is only 2401/2400 (0.72 cents) flat of 49/40, the larger septimal neutral third. In breed tempering, these are equated, dividing the fifth exactly in half. It is also 540/539 (3.2 cents) sharp of 11/9, and this is one of the ways 11-limit harmony is introduced into 7-limit scales. In particular, it is the interval between 7/6 and 10/7.