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- The data acquired from this service may be used freely for educational and non-commercial academic research purposes by registered users only. Redistribution of the data is subject to the same conditions of use. Please reference:Angling, M. J., and N. K. Jackson-Booth (2011), A short note on the assimilation of collocated and concurrent GPS and ionosonde data into the Electron Density Assimilative Model, Radio Sci, 46(RS0D13).
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