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Scatter plots in the Twist–Roll plane of observed parameters and derived energy contours of pyrimidine–purine (YR), purine–purine (RR), and purine–pyrimidine (RY) dimer steps. See legend to Fig. 1. Note the gradually decreasing areas of the 3Δθ ellipses from left to right. Corresponding plots for B–DNA are found at the following URL: http://rutchem.rutgers.edu/∼olson/pdna.html.
