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  Indian J Med Microbiol
 

Figure 2: Response surface plots showing the predicted values of extraction yield: The effects of two variables on the response extraction yield (Y1, mg/g), with the other two fixed at 0 level. (X1: Extraction time, min; X2: Ratio of liquid to solid, mL/g; X3: Extraction temperature, °C; X4: Methanol concentration)

Figure 2: Response surface plots showing the predicted values of extraction yield: The effects of two variables on the response extraction yield (<i>Y</i><sub>1</sub>, mg/g), with the other two fixed at 0 level. (<i>X</i><sub>1</sub>: Extraction time, min; <i>X</i><sub>2</sub>: Ratio of liquid to solid, mL/g; <i>X</i><sub>3</sub>: Extraction temperature, °C; <i>X</i><sub>4</sub>: Methanol concentration)