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Figure 1: A look-down event between levels 1 and 3. Each line living at level at least 3 before thelook-down event is pushed one level up after it.
Figure 2: The look down process and its associated coalescent tree, started at time tThe line of the individuallevels
Figure 3: In this example, the fixation curve GAt times∗ is bold whereas the next fixation curve G is dotted

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