In {TAIL ~ another embodiment}, {HEAD ~ reference data} could be provided by other aircraft systems 146 
In
In { TAIL ~ another embodiment } , { HEAD ~ reference data } could be provided by other aircraft systems 146
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH