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Table 1 Matrix for the CCD

From: Green waste recycling of peanuts highly contaminated with aflatoxins in clay brick manufacturing

Factor Level
Low Central High   
(−1) (0) (+1) (−α) (+α)
X1: Clay replacement, % 6 20.50 35 0 41
X2: Firing temperature, °C 725 800 825 693.93 906