This figure shows the two-dimensional faces of two abutting three-dimensional structured grid cells. The donor cell face is drawn using solid lines, and has corners labeled "i=20,j=10,k=2", "i=20,j=11,k=2", "i=20,j=10,k=3", and "i=20,j=11,k=3". The receiving cell face is drawn using dashed lines, with one corner labeled "R" inside the donor cell face. Arrows are drawn showing that the location of point "R" in the donor zone is "0.75 in the j direction" and "0.45 in the k direction".