{HEAD ~ The panel} is optimized in {TAIL ~ term} of space requirement and weight for use in aircraft and has improved sound absorption properties 
is optimized in
{ HEAD ~ The panel } is optimized in { TAIL ~ term } of space requirement and weight for use in aircraft and has improved sound absorption properties
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH