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By Eduardo H. Rapoport

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The maximum propinquity tree or the most economic one (in distances) is also the most probable one. Detailed field work, however, would permit modifying some of the arcs in such a way as to construct the most likely tree. For example, in Fig. n. n. erythropygia to the north, the latter subdivided into two large stocks (A9B). The distance between A and C is only a little shorter than the one between A and B. In a case like this, common sense makes us discard the ACB option and accept the ABC one as the most probable.

5. 23 The approximate form of the range of a propagule with growth-rate imposed by the anisotropy of the medium. 1, 2, 3 are the growth-rates in units of length per unit of time, assigned at random to the different parcels. An interesting point that can be tested with the "ruler and compass" model is seeing what happens when half of the areas is erased from one of the figures as Fig. 3. In other words, what happens after a marine ingression, areal glaciation or any other natural agent of massive destruction, that is, when the sea or the glaciers retire leaving a no-man's land?

Nevertheless, the most probable thing is that B is an intermediate locality. The maximum propinquity tree or the most economic one (in distances) is also the most probable one. Detailed field work, however, would permit modifying some of the arcs in such a way as to construct the most likely tree. For example, in Fig. n. n. erythropygia to the north, the latter subdivided into two large stocks (A9B). The distance between A and C is only a little shorter than the one between A and B. In a case like this, common sense makes us discard the ACB option and accept the ABC one as the most probable.

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