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Three-dimensional plots of response surfaces for the effects on the response of (a) the solid-to-liquid ratio and percentage of water (g GAE 100 g−1 of skin) at three different temperatures; (b) the solid-to-liquid ratio and temperature (g GAE 100 g−1 of skin) at two different percentages of water; (c) the temperature and percentage of water (g GAE 100 g−1 of skin) at five different solid-to-liquid ratios.
