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Fraction of [(a3-X)+w2] ions in the MS/MS of the ESI-produced [M-2H]2− ions of d(TTXTT), where ‘X’ = dA, dT, dC, dG, O2-EtdT, N3-EtdT, O4-EtdT (a), and dA, dT, dC, dG, O2-MedT, O2-iPrdT and O2-iBudT (b).