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The 3D response surface and contour plots exhibiting combined effects of (A) PDI versus Tw80 (%) and PC-EO (%), hold value: water (%) 91.34; (B) PDI versus Tw80 (%) and water (%), hold value: PC-EO (%) 0.55; (C) PDI versus water (%) and PC-EO (%), hold value: Tw80 (%) 7.66.
