{TAIL ~ Tp} is typically {HEAD ~ between 20 and 300 seconds} and αt between 0 and 5 
{ TAIL ~ Tp } is typically { HEAD ~ between 20 and 300 seconds } and αt between 0 and 5
TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH