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