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. Author manuscript; available in PMC: 2012 Aug 14.
Published in final edited form as: Anal Chem. 2012 Jul 18;84(15):6317–6320. doi: 10.1021/ac301541r

Fig. 2.

Fig. 2

Same as Fig. 1 for two monomethylated variants, measured using He/N2 with 0 – 47% He or H2/N2 with 60% or 70% H2. The data for additional gas compositions are in Figures S3 and S4.