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Accurate <jats:italic>T<\/jats:italic>\n<jats:sub>m<\/jats:sub> and thermodynamic values could be easily extracted from the data, whereas classical recordings at 260 nm led to a much larger uncertainty and in extreme cases, to completely inaccurate measurements. This inverted denaturation profile was observed for all G\u2010quartet\u2010forming oligonucleotides studied so far. 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