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Histograms of estimated ρ 1 using CCA for within the sunspots (a) and the magnetic fragments (b) using 3 × 3 patches. (c) Scatter plot of ρ 1 values and the number of samples available for within the sunspots. All points are above the magenta line which gives the threshold for statistical significance at a false alarm rate of 0.05 (Hero & Rajaratnam 2011).
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