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Zp versus sugar pseudorotation phase angle P for the four datasets. The four nucleotides constituting a basepaired dinucleotide step corresponding to a particular Zp value have been colour coded as follows: 5'-end Strand 1 – Blue; 3'-end Strand 1 – Red; 5'-end Strand 2 – Green; 3'-end Strand 2 – Black.
