The variation of such intensity could be defined as a function of the navigation data and {HEAD ~ the data} representative of {TAIL ~ one or more waypoints} 
representative of
The variation of such intensity could be defined as a function of the navigation data and { HEAD ~ the data } representative of { TAIL ~ one or more waypoints }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL