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Does this help: http://dox.ipxe.org/structieee80211__ie__power__capab.html

802.11 Power Capability information element More...

Data Fields
u8  id
    Power Capability ID: 33. 
u8  len
    Power Capability length: 2. 
u8  min_txpower
    Minimum possible TX power, dBm. 
u8  max_txpower
    Maximum possible TX power, dBm.