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. 2006 Sep 23;4:18. doi: 10.1186/1477-5956-4-18

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Copyright © 2006 Wolski et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Deviation Δ^ppmof peptide masses from mass cluster centres predicted using the Equation 24 in parts per million [ppm]. Gray line – moving average of Δ^ppm. Orange lines – Standard deviation of Δ^ppm, Green lines – 1% and 99% Quantile computed for mass windows having a size of 15Da and covering the mass range. Magenta dot dashed line – maximum possible deviation from cluster centre, which can be assigned to the true cluster centre using the Equation 30. Horizontal dotted blue line – distance of DHB (2,5-dihydroxybenzoic acid) matrix clusters from the peptide mass cluster centres; dashed line – distance of alphacyano (alpha-Cyano-4-hydroxycinnamic acid) clusters from the peptide mass cluster centres; distance of sinapicacid (3,5-Dimethoxy-4-hydroxycinnamic acid) clusters from peptide mass cluster centres.