Fig. 3

Aggregate growth calculated with the extended DLA model. The square lattice is made of 256 * 256 sites, and the number of surface-diffusion steps is 20. a Diffusing monomers randomly appear inside the bright area with a radius of 110 lattice spacings. b Monomers are inserted far away from the growing structure. This latter is a single site at the beginning of the simulation c Monomers are inserted far away from the growing structure. This latter is a circular particle of 20 lattice-spacing radius at the beginning of the simulation. The green-to-red color scale indicates the time at which aggregation occurred: the oldest aggregation events appear in green and the most recent in red