A processing stage may be included which has {HEAD ~ a pair} of {TAIL ~ surfaces} configured to heat and compress the tow therebetween 
of
A processing stage may be included which has { HEAD ~ a pair } of { TAIL ~ surfaces } configured to heat and compress the tow therebetween
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH