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Validation results of the GPR model based on the combined kernel function under WHTC: (a_1) validation results of engine torque under WHTC; (a_2) R2 result of engine torque under WHTC; (b_1) validation results of T4 under WHTC; (b_2) R2 result of T4 under WHTC; (c_1) validation results of NOx emission under WHTC; (c_2) R2 result of NOx emission in WHTC.
