Figure 2.

Ramachandran plots for the 121,497 angle pairs that make up the PDB dataset for the residue glycine, along with density estimates based on both the normal and von Mises distributions. The normal model is from the work of Dahl et al. (2008), whereas the von Mises estimate is based on our model in Section 3. Note that glycine spans almost the complete range of values in both φ and ψ, which makes the use of a method that correctly models circular data critical.