Snapshots of the monomer and dime systems at various self-propelled forces. SPPs are represented as red disks and passive particles including passive spheres and rod-like particles are represented as blue disks. The inset in the upper-right corner is the corresponding Voronoi cells for part of the monomer system at F_a = 1. The Voronoi area is the area of each polygon with blue edge in the inset. The inset in the lower-left corner is the enlarging crystal-like cluster for part of the monomer system at F_a = 1.