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