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. 2016 Feb 3;7:10557. doi: 10.1038/ncomms10557

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(a) Dots indicate the characteristic vorticity length scale and the screening length at which the vortex lattice emerges for extensile and contractile systems, each for two different values of the activity. The red line indicates L_ω=L_sc. (b,c) Colormaps of the structure factor for defects showing the emergence of positional ordering of defects at high friction for (b) extensile rod-like and (c) contractile disk-like particles.