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Table 1 Range and levels of independent variables

From: Process optimization of Calophyllum inophyllum-waste cooking oil mixture for biodiesel production using Donax deltoides shells as heterogeneous catalyst

Name Symbols Units (−) α Low Middle High (+) α
Catalyst concentration A wt% 4.64 6 8 10 11.36
Methanol to oil ratio B % (v/v) 55.18 62 72 82 88.82
Reaction time C Min 99.55 120 150 180 200.45