{TAIL ~ The method} 13, wherein {HEAD ~ the first system} is a first spacecraft and the second system is a second spacecraft 
{ TAIL ~ The method } 13 , wherein { HEAD ~ the first system } is a first spacecraft and the second system is a second spacecraft
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH