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. Author manuscript; available in PMC: 2010 Feb 8.
Published in final edited form as: Rapid Commun Mass Spectrom. 2008 Dec;22(24):4158–4164. doi: 10.1002/rcm.3841

Figure 4.

Figure 4

Correlation analysis comparing the difference between theoretical and observed nitrate concentrations with theoretical concentrations for a range of unlabelled nitrate standards from 5 mmol/L down to 0.078 mmol/L, spiked with Na15NO3.