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. 2015 Apr 20;10(4):e0123146. doi: 10.1371/journal.pone.0123146

Fig 5. Left: Distribution of helical backbone torsion angles (Φ, Ψ) for 1.0–1.5 Å nominal resolution of 3,462 protein structures from the PDB.

Fig 5

Right: Conversion of density of high-resolution helices to a relative energy scale by Boltzmann-weighting the distribution.