Fig. 1
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Demonstration of pre-processing of photospheric magnetic maps (top) through spherical harmonics processing, with lmax of 30 (middle) and 15 (bottom). On the left, the magnetic map from the selected minimum of activity case (August 1, 2008 eclipse) is shown. On the right, the magnetic maps correspond to the maximum activity case (November 13, 2012 eclipse). Units are in Gauss.
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