(Color online) Cooperation level as a function of the parameter on different square lattices under the best-take-over rule with uniform initial strategies distribution.

<p>(a) Results on the square lattice with 4-player neighborhood and synchronous updating; (b) Results on the square lattice with 8-player neighborhood and synchronous updating; (c) Results on the square lattice with 4-player neighborhood and asynchronous updating; (d) Results on the square lattice with 8-player neighborhood and asynchronous updating.