The cross section and luster of {HEAD ~ the fibers} or {TAIL ~ the filament} may be varied, e.g., as dictated by requirements of the intended end use 
The cross section and luster of { HEAD ~ the fibers } or { TAIL ~ the filament } may be varied , e.g. , as dictated by requirements of the intended end use
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH