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Principal features of the Chinese Reference Ionosphere(CRI) are described in brief with an emphasis on its difference from the IRI. The CRI improvements include a model for the F 2 -layer prediction for use in the Asia-Oceania Region(known as the AOR mapping) replacing the CCIR or URSI coefficients in the IRI-90, a model of the F 1 -layer occurrence for use in China removing the restriction...