As shown in FIG 2 b, the edge wrapped lines 36 therefore have {HEAD ~ a rounded shape} like {TAIL ~ a semi circle} 
like
As shown in FIG 2 b , the edge wrapped lines 36 therefore have { HEAD ~ a rounded shape } like { TAIL ~ a semi circle }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL