{HEAD ~ Such variables} characterizing {TAIL ~ the combustion} in the combustion chamber are already recorded in modern internal combustion engines 
characterizing
{ HEAD ~ Such variables } characterizing { TAIL ~ the combustion } in the combustion chamber are already recorded in modern internal combustion engines
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH