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Table 1 Independent variables and levels of experimental design

From: Optimization of inulin production process parameters using response surface methodology

S. no. Independent variables Code level
Low (− 1) Mid (0) High (+ 1)
1. Heating temperature °C (A) 115 120 125
2. Creep speed rpm (B) 20 22 24
3. Pressure MPa (C) 0.02 0.03 0.04