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. 2015 Apr 29;16:137. doi: 10.1186/s12859-015-0546-8

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© Modolo and Lerat; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Probability-phred functions. p(q,t) according to the choice of t. The white, dark grey, light grey and black dots represent respectively the position of p ₁,p ₂,p ₃ and p ₄ for the corresponding probability-phred functions. Before p ₁ we have the $1 - 2^{\frac{- q}{t}}$ part of the function (B) and after p ₁ the B(q ^⋆,p ₁,p ₂,p ₃,p ₄) part of the function (B).