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a-c Contour plots showing effect of sodium phosphate and sodium chloride concentration on (a) resolution, (b) monomer efficiency, and (c) asymmetry. Values listed in the shaded region represent mean performance metrics for the (0,0) control point (n = 12, 3 injections on each of four days), for all other points n = 3 on one day. Contour lines represent a quadratic fit to the data using Dataplot
