Average porosities for a) populations built from CCA collisions, and b) populations built from PCA collisions. c) Percent difference between aggregates built using different monomer shapes within the same collision regime. The lines in a) and b) represent the porosities of populations grown without using an offset or rotation. The darker line corresponds to aggregates comprised of ellipsoidal monomers, while the lighter is for aggregates comprised of spherical monomers. In a) the differences between spheres and ellipsoids are so small that the trend lines coincide at all points.