It has been found that {TAIL ~ CaX type adsorbents} provide the removal of N2O and hydrocarbons in {HEAD ~ the third layer} 
It has been found that { TAIL ~ CaX type adsorbents } provide the removal of N2O and hydrocarbons in { HEAD ~ the third layer }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD