In {TAIL ~ a system} for locating {HEAD ~ a moving object} with respect to an axis comprising: 
In { TAIL ~ a system } for locating { HEAD ~ a moving object } with respect to an axis comprising :
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH