Comment on "Fundamentals of pair diffusion in kinematic simulations of turbulence".

Osborne et al [Phys. Rev. E 74, 036309 (2006)] suggested that our conclusions on the ability of kinematic simulation to represent the t(3) Richardson law [Thomson and Devenish, J. Fluid Mech. 526, 277 (2005)] were an artifact of our choice of time step. Here we repeat some of the simulations with a small fixed time step, enabling us to confirm that our previous study was not compromised by the variable time step used.