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Fig. 6.


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Data and model fit of a time step of the second-highest flux subsample (⟨Φ⟩=7.0 × 1021 Mx). The black line shows the latitudinal flow, averaged over longitudes in the range indicated in Fig. 4. The solid blue line shows the model fit of two Gaussians with opposite polarity (see text for details). The dashed blue lines show the 1σ error estimates of the fit. The red markings indicate the fit parameters of the amplitude A (in m s−1), the peak position μ (relative to the center of the active region along latitude, Δ Lat), and the standard deviation σ (in degree) of the two Gaussians. The gray shaded region indicates the rms of the flow data. The fit parameters of the two Gaussians slightly deviate from the fitted curve due to superposition; this is small compared to the error, however.

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