This corresponding output cylinder pressure is then compared with {HEAD ~ the actual known set} of {TAIL ~ cylinder pressure data} 
This corresponding output cylinder pressure is then compared with { HEAD ~ the actual known set } of { TAIL ~ cylinder pressure data }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL