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BLE packet structure

Please consider the images bellow, which can also be found ​​here​ and ​​here​. The images represent the structure of a BLE packet, and the units used are bytes. The question I have is regrading the Par/Pay section of the packet. The maximum amount of user data that can be contained in a packet is 20 bytes (as cited in multiple sources), so what are the remaining 2 bytes in that section used for?​

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