A) Cell seeding efficiency, defined as the ratio of the number of cells seeded in the microwells to the total number of cells used, as a function of well diameter and cell density. Theoretical values correspond to equation (4). B) Cell seeding error, defined as the ratio of the number of cells that fall on the array surface outside the microwells to the total number of cells on the array, for all well diameters and cell solution concentrations. C) Number of cells per well as a function of cell density, for both well diameters. Solid and dotted lines correspond to equation (3) and linear least-square fits with slopes 7.03 and 7.62 for d = 229 μm and 28.4 and 27.8 for d = 442 μm, respectively.