Curve C represents the amount of expansion or contraction of {HEAD ~ fine displacing element} 112 from {TAIL ~ its central position} 
Curve C represents the amount of expansion or contraction of { HEAD ~ fine displacing element } 112 from { TAIL ~ its central position }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL