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of the tetrachords and avoid the Meson being forced into three whole tone steps (b-a-g-f), an interstitial note, the diazeuxis ('dividing'), was introduced between the paramese and mese. This procedure gives its name to the tetrachord diezeugmenon, which means the 'divided'.

To bridge the inconsistency of the diazeuxis, the system allowed moving the nete one step up, permitting the construction of the Synemmenon ('conjunct') tetrachord, shown at the far left of the diagram.

The use of the Synemmenon tetrachord effected a modulation

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