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(a) Top view of the sample flow pattern during the “microfluidic drifting” 3D focusing process (5 mm downstream the exit of the 180-degree curve), indicating a focal width of ~2.5 µm. (b) Side-view of the 3D focused sample flow in the main channel, indicating a focal height of ~2.5 µm and (c) side view of the channel after the flows were stopped.
