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AD8606 Bode Plot

AD8606 supposed to be single-supply operation: 2.7 V to 5.5 V.

However the Bode plot seems to be wrong in single supply operation but looks fine with dual supply operation:

I read through the Q&A for AD8605 and AD8606 for similar questions but I couldn't find a direct answer to this.

Can someone please help to clarify again?

Thanks.