Accordingly, {HEAD ~ the outer passage} 11 has {TAIL ~ an annular cross section}, whereas the inner passage 10 has a full cross section 
Accordingly , { HEAD ~ the outer passage } 11 has { TAIL ~ an annular cross section } , whereas the inner passage 10 has a full cross section
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH