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Design maps showing contour plots for (a) maximum extraction length, Lext, and (b) extraction efficiency length, Ψ, as a function of microchannel half-width (w) and aqueous flow rate (Qaq). The contour lines for extraction length vary from 1 to 7 mm in increments of 1 mm, while the lines for efficiency vary from 75% to 95% in increments of 5%.
