{TAIL ~ The measured time} represents the relative position of {HEAD ~ the transducers} along the magnetostrictive element 
{ TAIL ~ The measured time } represents the relative position of { HEAD ~ the transducers } along the magnetostrictive element
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH