triad substituting the diminished sixth for a real fifth. If the diminished sixth is a wolf interval, this triad is called the wolf major triad.

Similarly, we obtain nine minor thirds of and three minor thirds (or augmented seconds) of

Quarter comma meantone

In quarter-comma meantone, the frequency ratio for the fifth is , which is about flatter than an equal tempered (or exactly one twelfth of a diesis)