Figure 2: 2-D plots showing the effects of (a) ratio of Lipid: Drug (X1) and surfactant (X2); (b) ratio of surfactant (X1) and sonication time (X3) on response Y1 2-D plots showing the effects of (a) ratio of Lipid: Drug (X1) and surfactant (X2); (b) ratio of surfactant (X1) and sonication time (X3) on response Y1