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a) Top view of spinning disk; b) Cross-sectional view of inside of spinning disk; c) During spinning annular fluid chamber volume is 8.5 mL. When spinning stops, the upper volume of 5.0 mL (represented by green color) is expected to flow down, while the volume of 3.5 mL (represented by violet color) is retained in the trough by the weir. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
