To specify multiple mass inflows (e.g., define a jet and uniform background flow), provide multiple velocities for the region and define the physical extents of the sub-region. The first velocity will be applied to the entire to domain. Subsequent velocities are successively applied. If multiple regions overlap, the last specified region is used. An example of a uniform mass inflow with a square-jet centered at (0.5x0.5) is given below.