{HEAD ~ A global time signal} from a global time reference or common time source can be used to calculate a common view based clock offset between {TAIL ~ the two clocks} 
{ HEAD ~ A global time signal } from a global time reference or common time source can be used to calculate a common view based clock offset between { TAIL ~ the two clocks }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL