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  • Ad size is logged for each bid response sent to a publisher. This becomes part of the bid data that's made available in reporting.
  • The PubMatic system supports multi-bid responses from DSPs. Each non-zero bid in a multi-bid response is counted individually. 
  • For bid requests that are not filled, PubMatic reporting shows the ad size as 'unknown'. This example is the Ad Size Performance report:

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How does multi-bid work?