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Different interactions and one-factor plot of independent variables as well as their effect on the dependent variable (PS). (a) 2-D contour plot showing interaction effect of concentration (% w/v) of CH and TPP on PS, (b) interaction plot showing interaction effect of concentration (% w/v) of CH and TPP on PS, (c) one-factor plot showing the effect of CH concentration (% w/v) on PS, and (d) one-factor plot showing the effect of TPP concentration (% w/v) on PS.
