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(A) The distribution of all eruptions from May 15, 2010 to July 12, 2014 show clustering near activity belts and the limb. Black, blue, and red circles display weak (< 10 km/s), medium (< 30 km/s) and strong (> 30 km/s) eruptions respectively. (B) Histogram of radial positions. Dots represent the number of events in 10 arcsec bins. The solid line is a theoretical distribution assuming the formation layer is uniform 15 Mm thick, while the dashed is the same for a 3.5 Mm layer. Both lines are scaled to match the maximum. The distribution is compatible with a layer thickness somewhere within the range of 3–15 Mm.
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