editing disabled

49/40
|-3 0 -1 2>
351.3381 cents
sound sample

49/40, the larger septimal neutral third, is only 2401/2400 (0.72 cents) sharp of 60/49, the smaller septimal neutral third. In breed tempering, these are equated, dividing the fifth exactly in half. It is also 441/440 (3.9 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 8/7 and 7/5.