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PO2 settings

I wonder if abyone can clarify this a bit?
In the dive setup of PO2 there are three setting. Two are obviuous, the the PO2 warning level and the PO2 critical level.
But then there is the first PO2 setting which is the “Deko, PO2” setting. What effectc does this have? It does not say in the manual.
I have discovered that the indication of the Max Operating Depth (MOD) on the first pre-dive display is dependent on the value set of the “PO2, Deko”.
This makes sense. But is this the only impact setting this value have, to show the MOD, or are there any other dependencies? And what does it have to do with Deco?
(Sorry if this is obvious, I am a new certificae of Nitrox ????)