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Independent formulation variables and their levels used in two factorial (one numeral, one categorical) linear experimental design formulation
| Variables | Levels | |||
|---|---|---|---|---|
| Surfactant Type | Span 40 | Span 60 | Span 80 | |
| Surfactant relative concentration | Low (-1) | Medium (0) | High (+1) | |
Mole ratio: Low (2.6), Medium (2.9) and High (3.2)
