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IWR6843ISK: I have some question for artwork desige of IWR6843.

Part Number: IWR6843ISK

Hi
I am now looking at and designing Altium data and documentation provided by TI.
In the design document it is written:

"note very important L1, L2, L4, L6 grounding, through VIAs"

This document is HardwareDesignChecklist_V0p8.

I want to know exactly what that means.
Does this mean that the VIA is connected to Layers 1, 2, 4, 6?

Also, I would like to know exactly where the VIA is in the Altium data.

i waiting for your answer.

Thanks.