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