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(a) Schematic of herringbone structures. (b) Cross-section of the channel with herringbones. For staggered herringbones, the height was 30 μm and the width was 70 μm. For straight ridges at the beginning of this channel, the height was 30 μm and the width was 80 μm; spacing was 180 μm for staggered herringbones and 95 μm for straight ridges.
