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FDC1004QEVM: Documentation clarification. Use of extra capacitors

Part Number: FDC1004QEVM

Hi all,

Reading the schematic of SNAU178 (page 8) I see three capacitors who's use I don't quite understand.

  1. CS1 connected between shield 1 and ground 51 pF
  2. CS2 connected between shield 2 and ground 51 pF
  3. COFF between CIN-3 and ground 100 pF

I assume the COFF is to demonstrate the offset capabilities of the sensor? Yes? 

What are CS1 and CS2 for? I can't find an explanation in the documentation.