Time-amplitude diagram for fΔ32 (black +), f1 (×), f2 (triangles), and f3 (°) in the SMEI data. The semi-amplitudes were derived from fits of single sine functions over windows of 100 d (fΔ32 : 300 d) stepped by 10 d (fΔ32: 30 d). From bottom to top, the curves are vertically shifted by 0, 10, 20, and 30 mmag, respectively.
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