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Figure 2: (a) Response surface design plots (three dimensional) and contour plots (two dimensional) describing the effect of independent variables on dependent variable, i.e., particle size. (b) Response surface design plots (three dimensional) and contour plots (two dimensional) representing the effect of independent variables on dependent variable, i.e., Polydispersity index (PDI). (c) Response surface design plots (three dimensional) and contour plots (two dimensional) representing the effect of independent variables on dependent variable, i.e., %EE 
