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Fig. 6

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Modulus of the cross-coherence between three proxies (F30, MgII, SEM and F10.7) and the thermospheric density at 250 km altitude (a), 550 km altitude (b), from 1996 to 2011. Coloured bands correspond to a ±σ confidence interval. The 27-day and 13.5-day periods, and periods associated with seasonal variations are indicated by dashed lines.

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