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TPS61071-Q1: The layout of TPS61071-Q1

Part Number: TPS61071-Q1
Other Parts Discussed in Thread: TPS61071

Hi

I have questions about layout of TPS61071-Q1.
Could you tell me under questions
①Top is 1 layer, bottom is 2 layer, is this understanding correct?
     Even granted that  it is correct, I can't recognize those difference.
     Could you tell me about these difference?
②Is this the through-hole?
③What is this area?
Best regards,
Yokota