Figure 5

Chips with different resolutions have been developed. The array size was kept constant at 16 × 10 mm but the diameter of the cavities was varied. The chip with the lower resolution (a) contains 1188 cavities with a diameter of 300 μm. Our standard chip (b) is composed of 4104 cavities with a diameter of 150 μm each. Finally, the chip with the higher resolution (c) contains 31672 cavities with a diameter of 50 μm per cavity.