Each channel section may include a flange along at least one side thereof, {HEAD ~ the connection mechanism} being provided on {TAIL ~ the flange} 
provided on
Each channel section may include a flange along at least one side thereof , { HEAD ~ the connection mechanism } being provided on { TAIL ~ the flange }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL