{TAIL ~ A method} and {HEAD ~ apparatus} for determining the relative positions of a first object and a second object  
{ TAIL ~ A method } and { HEAD ~ apparatus } for determining the relative positions of a first object and a second object
TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH