{TAIL ~ Other environmental conditions} that interfere with the transmitting and receiving signals may further bear on the values of V1 and {HEAD ~ V2} 
{ TAIL ~ Other environmental conditions } that interfere with the transmitting and receiving signals may further bear on the values of V1 and { HEAD ~ V2 }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD