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The CC1100/CC1101/CC1150/CC2500/CC2500 all have an eight bytes long PATABLE used for selecting PA power control settings. This design note will describe the different ways the PATABLE can be accessed and how the PATABLE for CC1150 and CC2550 is slightly different than it is for the CC1100, CC1101, and CC2500.
http://www.ti.com/lit/swra110