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. 2012 Jan 5;8(1):e1002308. doi: 10.1371/journal.pcbi.1002308

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Mann 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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Prawns moving within an annulus of 200 mm external diameter and 70 mm internal diameter. Red coloured prawns indicate a clockwise orientation, blue prawns a counter-clockwise orientation. In this instance the total number of prawns , number of clockwise-moving oriented prawns , the polarisation , and the excess polarisation .

Inline graphic — Prawns moving within an annulus of 200 mm external diameter and 70 mm internal diameter. Red coloured prawns indicate a clockwise orientation, blue prawns a counter-clockwise orientation. In this instance the total number of prawns , number of clockwise-moving oriented prawns , the polarisation , and the excess polarisation .