{TAIL ~ The underside} of {HEAD ~ each channel base} provides a relatively large lateral dimension for fastening individual channels together by means of a transverse stringer or strut 
{ TAIL ~ The underside } of { HEAD ~ each channel base } provides a relatively large lateral dimension for fastening individual channels together by means of a transverse stringer or strut
TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH