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Comparison between a spectrum S={2, 9, 11, 15} with two PTMs and a spectrum T={2, 6, 8, 10} without PTMs. (a) Spectrum S has two PTMs of 3 and 2 when compared with spectrum T. The PTMs are shown in shaded areas in the vector representation of S. (b) S and T(3) have the best mass counting score of 2 among all T(d)
