Meansquared
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Meansquared is a nonoctave regular temperament repeating at 4/1 based on a chain of tempered 9/4 major ninths. It tempers out 6561/6400 (or 81/802) in the 4.9.25 subgroup. This temperament is the precise stretching of meantone temperament by a factor of 2. The name was first coined by CompactStar. Meansquared in the 4.9.25 subgroup is an insane restriction of the 4.9.5 subgroup, because it includes the interval of 100/81~81/64 which is effectively 5/4.