{TAIL ~ The two sets} of two coils are positioned on {HEAD ~ two different sides} of the array 
{ TAIL ~ The two sets } of two coils are positioned on { HEAD ~ two different sides } of the array
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH