The instruments 44 are coupled to {TAIL ~ the control unit} 16 by {HEAD ~ a cable} 46 
The instruments 44 are coupled to { TAIL ~ the control unit } 16 by { HEAD ~ a cable } 46
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH