the aircraft display unit is comprised of a head up display unit configured to display {HEAD ~ the image} represented in {TAIL ~ the synthetic image data} 
represented in
the aircraft display unit is comprised of a head up display unit configured to display { HEAD ~ the image } represented in { TAIL ~ the synthetic image data }
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