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Actual versus experimental- HCCI emission model. Dashed red line represent ± 5% of experimental data value: (a) CO – NLSVM – L13 – actual versus experimental, (b) HC – NLSVM – L7 – actual versus experimental, (c) NOx – LSVM – L13 – actual versus experimental, and (d) CO2 – NLSVM – L7 – actual versus experimental.
