A) An η-θ plot of non-helical C3′-endo nucleotides, with each nucleotide represented as a point.
B) Smoothing applied to the η-θ plot shown in A. Point density is represented on the z-axis.
C) The clusters of nucleotides resulting from the smoothing seen in B.
Representative nucleotides from each cluster in C are shown across the bottom.
(Wadley et al, JMB 2007)