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(a) R12eff estimates obtained considering only positive values (from 0 to 200) for its derivation (first panel) and full ranged (from −30 up to 200) R12eff (second panel) for September 24, 2006. (b) foF2 observations and monthly median estimates in comparison to SIRMUP1 (old) and SIRMUP2 (improved) predictions for Athens and Juliusruh (after Tsagouri et al. 2010).
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