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Fig. 8


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10-day averaged GRACE density ratios (O/C) obtained with the F10.7 and F30* thermosphere models and 81-day mean F10.7 and F30* proxies. (a) Full record, (b) zoom on the period January 2007–June 2009 and (c) the differenced density ratio Δ(O/C) (see Eq. 2) for the period January 2004–December 2005.

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