While {HEAD ~ canister} 42 is shown as {TAIL ~ a cylindrical cross section}, conical cross section elements may be employed in alternative embodiments 
is shown as
While { HEAD ~ canister } 42 is shown as { TAIL ~ a cylindrical cross section } , conical cross section elements may be employed in alternative embodiments
OTH HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH