η − θ conformational space of the complete-data set. Results are divided into nonhelical North (top-panels) or South (bottom-panels) sugar conformations. Density contours of 
(X = 1, 2, or 4; dark red, violet, and dark blue, respectively) highlight regions of the plots with a significant population
of nucleotides. Black dashed lines delimit the region occupied by canonical helical A-form (those structures are removed from
the analyses as described in the Materials and Methods section). Cluster numbers are identified in black in the left panels. (A) The panel on the left shows densities and sequence logo-plots of the complete-data set for sugars in North. The panel on the right shows the corresponding dot-plot with adenine (green), uracil (red), guanine (yellow), and cytosine (blue). (B) Same as (A) for South conformations.
