where R0 and {HEAD ~ ω0} are constants and t is a time; the scanning operation is performed at {TAIL ~ a constant angular velocity} 
where R0 and { HEAD ~ ω0 } are constants and t is a time ; the scanning operation is performed at { TAIL ~ a constant angular velocity }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL