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. 2021 Nov 3;10(11):1755. doi: 10.3390/antiox10111755

Figure 4.

Figure 4

3D surface graphs of the Box–Behnken design according to the polynomial equations representing the effects from the different interactions on the total phenolic compounds extractions: (a) %MeOH and amplitude; (b) %MeOH and cycle; (c) %MeOH and temperature; and (d) temperature and ratio.