In this embodiment, {HEAD ~ the bottom wall} 154 is longer than {TAIL ~ the top wall} to facilitate attachment of the coil restraints to the trough as indicated above 
is longer than
In this embodiment , { HEAD ~ the bottom wall } 154 is longer than { TAIL ~ the top wall } to facilitate attachment of the coil restraints to the trough as indicated above
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH