Simulation parameters used for the one-dimensional IBM of movement and resulting macroscopic diffusion coefficients.

N0 = 3000 (i.e. simulations are far from continuous-time regime), Δx = 1, and τ = 1. The corresponding microscopic diffusion coefficients are calculated using Eq (3). To estimate the macroscopic diffusion coefficients we measure the variance in the position of all individuals at different time points. Since the variance of the position is a time series we calculate its time derivative and estimate the mean of the derivative. The macroscopic diffusion coefficients are then estimated using Eq (2).