Fig. 11.
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Interpolation maps for high solar activity (left) and low solar activity (right). Top: Number of reference bubbles for a given solar activity (NRBY). Middle: Probability of EPBs occurrence for a given month (POM), January. Bottom: Probability of EPBs occurrence for a given Local Time (POLT), 20LT. Blue triangles correspond to receivers used in the interpolation and the numbers are the corresponding values at each location.
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