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802.11n aggregation

IEEE802.11n introduced two methods to combine multiple IP payloads in a single wifi packet.
- are these payloads separated in the wifi adapter, in the driver or in the Linux kernel?
- are those super-packets visible at the wireshark level? If yes, where can I find an example capture file?
- if they are separated in the driver or in the adapter, pseudo-headers must be created. How are managed the sequence number (SN) in the pseudo-headers?