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Table 3 Central composite design: input variables and their levels

From: Orchestration an extracellular lipase production from Aspergillus niger MYA 135: biomass morphology and fungal physiology

Input variables Levels
− α − 1 0 + 1 + α
X1
 N:C ratio 0.200 0.281 0.400 0.519 0.600
X2
 FeCl3 (g/L) 0.050 0.080 0.125 0.170 0.200
X3
 Olive oil (g/L) 10.000 14.000 20.000 26.000 30.000