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AD9746 SFDR

Hi

I have a couple of questions about AD9746.
Datasheet says that SFDR is 82, 70 and 66 dBc in the individual conditions.
Do these values represent the specifications to 2nd/3rd harmonic distortion or not ?
I wonder if these values represent the specifications to the noise in the Nyquist band.
Please let me know the definition of SFDR in the datasheet of AD9746.

Best Regards