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MSP430FR2633: What's the use of those grids on the edge of CAPTIVATE-E-LOCK PCB?

Part Number: MSP430FR2633

Hi,

On CapTivate E-Lock PCB,we find it Pin15 (CAP0.3) connected to blue grids on edge. (Marked with arrows)

There are those BLUE grids:

Please let us know what's the use of those blue grids?

Thank you,

Luxiye

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