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. Author manuscript; available in PMC: 2011 Jul 9.
Published in final edited form as: J Chromatogr A. 2010 Jul 9;1217(28):4743–4748. doi: 10.1016/j.chroma.2010.05.023

Table 2.

Experimental factors and levels used in the three level factorial design

Factors Level (−) Level (0) Level (+)
Focus Channel length (l, µm) 0 400 800
Sheath Flow intersection angle (θ, °) 15 30 45