In particular, the reference unit can either be connected directly to the reference junction with {HEAD ~ its connector} screwed into {TAIL ~ the lower threaded cavity} 64 or, as shown in FIGS 5 and 7, the reference unit can be connected indirectly to the reference junction by a coaxial adapter 68 and a coaxial cable 49 
screwed into
In particular , the reference unit can either be connected directly to the reference junction with { HEAD ~ its connector } screwed into { TAIL ~ the lower threaded cavity } 64 or , as shown in FIGS 5 and 7 , the reference unit can be connected indirectly to the reference junction by a coaxial adapter 68 and a coaxial cable 49
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