One of {HEAD ~ three AGC windows} can be selected through associated register according to {TAIL ~ one embodiment} of the present invention 
One of { HEAD ~ three AGC windows } can be selected through associated register according to { TAIL ~ one embodiment } of the present invention
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH