In {TAIL ~ the illustrated embodiment}, {HEAD ~ the inboard and outboard edges} are parallel to each other and perpendicular to the top and bottom edges, with the overall plan of the detector heads being substantially square 
In
In { TAIL ~ the illustrated embodiment } , { HEAD ~ the inboard and outboard edges } are parallel to each other and perpendicular to the top and bottom edges , with the overall plan of the detector heads being substantially square
REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD 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 OTH OTH OTH OTH OTH OTH