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Relationships between δfoF2 (top panels), δfoF1 (middle panels) and δfoE (bottom panels), and Ap132 variations for Slough (left panels) and Rome (right panels). The change in the type of the dependences appeared earlier in the E region, later in the F1 region, and eventually it began to appear in F2 region. After Bremer et al. (2009).
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