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. Author manuscript; available in PMC: 2013 Jul 8.
Published in final edited form as: Anal Chem. 2010 Mar 1;82(5):1867–1880. doi: 10.1021/ac902571u

Figure 7.

Figure 7

Alpha curve plot for norfentanyl. Alpha Plot for norfentanyl under 4 different transport gas conditions. i) nitrogen with 1.5% 2-propanol, ii) nitrogen, iii) nitrogen with 28% helium, and iv) nitrogen with 37% helium.