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. 2020 Jan 27;18(2):82. doi: 10.3390/md18020082

Figure 1.

Figure 1

Contour plots (a,c,e) and response surface plots (b,d,f) showing the effects of the variables (X1, enzyme concentration; X2, enzymolysis time; and X3, enzymolysis temperature) and their mutual effects on the extraction yield of the krill oil.