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  Indian J Med Microbiol
 

Figure 4 Contour plot of lipase production by Aspergillus niger showing the interactive effects of different concentrations of X1 and X2 (a), X3 and X2 (b), and X1 and X3 (c), Y: lipase activity (U/ml).

Figure 4 Contour plot of lipase production by <i>Aspergillus niger</i> showing the interactive effects of different concentrations of <i>X</i><sub>1</sub> and <i>X</i><sub>2</sub> (a), X<sub>3</sub> and X<sub>2</sub> (b), and X<sub>1</sub> and X<sub>3</sub> (c), Y: lipase activity (U/ml).