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Response surface 3D plot of sun protection factor (Y1) as a function of the concentration of UV filters: butylmethoxydibenzoyl methane—UVA, ethylhexyl methoxycinnamate—UVB and ethylhexyl dimethyl PABA—UVB of 0–12% w/w (X1), grape pomace extract concentration of 0–10% w/w (X2) and irradiation time of 1–2 h (X3).
