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. 2008 Nov 4;99(11):1859–1866. doi: 10.1038/sj.bjc.6604753

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Copyright © 2008 Cancer Research UK

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Raw spectral data (A) and the effect of three pre-processing steps above on an example subset of the FTIR data with the variable CO₂ region removed. (B) Vector normalisation (model A), (C) vector normalisation combined with first derivatisation (model B) and (D) vector normalisation combined with second derivatisation (model C).