Fig. 6.

We varied the volume fraction by two orders of magnitude from φ = 4 × 10⁻⁴ to ~6 × 10⁻². We typically recorded five movies at each volume fraction from which we could analyze multiple 128 × 128 ROIs. We include x error bars in the higher volume fractions as some uncertainty in introduced by concentrating the beads from the volume fraction supplied, φ = 2 × 10⁻².