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