[SI-LIST] Opening in Ground Plane

Hi all
 
In the Evaluation Board of an A/D we have seen there is an opening in some area 
in the ground plane (just after TOP layer) beneath the analog differential 
input.
 
the figures of the first 3 layers are attached.
 
what could be the reasons of designer for doing so?
 
Best Regards.
 
 
 
 
 
 
 

      
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