| DME | dimethyl ether |
| LPG | liquid petroleum gas |
| CH4 | methane |
| CO2 | carbon dioxide |
| CI | compressed ignition |
| SI | spark ignition |
| CNG | compressed natural gas |
| CO | carbon oxide |
| THC | hydro carbon |
| NOx | nitrogen oxides |
| TDC | top dead center |
| imep | indicated mean effective pressure |
| COV_imep | covariance of imep |
| CA | crank angle |
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