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