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. Author manuscript; available in PMC: 2013 Jan 17.
Published in final edited form as: Anal Chem. 2011 Dec 30;84(2):994–1002. doi: 10.1021/ac202548n

Figure 2.

Figure 2

Impact of spectral resolution on the performance of “Add to Subtract” on sample set 1. (a) Spectrum of the original healthy sample (control); (b)–(f) Metabolite signal uncovered by “Add to Subtract” for the original FIDs (64 k data size, 5 k Hz spectral width) with different digital resolution. Spectra with the two lowest resolutions were enhanced by zero filling the FID before Fourier transformation. The 16 k and 8 k spectra did not provide enough resolution for correct glucose background removal.