The top cap member has a channel like configuration which includes outer side flanges which slidably overlap and embrace exterior sides of the panel member to permit {HEAD ~ at least limited vertical positional adjustability} of the top cap member relative to {TAIL ~ the panel member} 
relative to
The top cap member has a channel like configuration which includes outer side flanges which slidably overlap and embrace exterior sides of the panel member to permit { HEAD ~ at least limited vertical positional adjustability } of the top cap member relative to { TAIL ~ the panel member }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL