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On the basis of unbiased expectation E[z*(x0)] = E[z(x0)], E[z*(xi)] refers to the spatial variation of PM2.5 concentration in BTH by OKM in point xi, E[z*(x0)] denotes the spatial variation of PM2.5 concentration in BTH by OKM in point x0, and z(x0) is the PM2.5 concentration in point x0.
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