Fig. B.1
Merger tree algorithm. All neutral cells are black with an identification number of −1. All ionized cells are white with an identification number. At time t, we have the ionized region identified with an identification number of 1. We look forward to time t + 1 where cells of this ionized region are located (shown in red). Here ID 1 at time t is linked to ID 2 at time t + 1.
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