=== Introduction === Supplemental Material for the article Synergetic Fluid Mixing from Viscous Fingering and Alternating Injection.<
> B. Jha, L. Cueto-Felgueroso, R. Juanes, Physical Review Letters, 111, 144501 (2013), doi:10.1103/PhysRevLett.111.144501. The supplemental material consists of three videos with the evolution of the concentration field during alternating injection of miscible fluids with different values of the viscosity contrast M: === Video 1 === In the first video, M=1 (no contrast in viscosity). <> === Video 2 === In the second video, M=7. <> === Video 3 === In the third video, M=33. <>