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