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. 2015 May 13;10(5):e0125453. doi: 10.1371/journal.pone.0125453

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© 2015 Lennartsson et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 7 — The offensive starting position is denoted by a triangle and the defensive positions are denoted by circles. Here B ₁ has critical speed $v_{B} = \frac{v_{A} (r_{A} - r)}{r_{A}}$ and the present isoline is circular.