The column 7 and {TAIL ~ the entire apparatus} may be wrapped in {HEAD ~ a thermally controlled housing} 11 as represented in herringbone patterned fill in 
The column 7 and { TAIL ~ the entire apparatus } may be wrapped in { HEAD ~ a thermally controlled housing } 11 as represented in herringbone patterned fill in
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH