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