Projection of the data into the conformational space of the internal angles ( ϕ
, θ ). Each dot (orange) corresponds to a fragment. The plot is split at the periodic boundary -180/180° of the θ angle, while the angle range of the θ1 and θ2 dimensions has been cropped to the populated region. Fragments of the M32K25 alphabet (see text) are shown as labelled circles and four selected fragments (Y blue, U red, P cyan, A yellow) are rendered as ball-and-stick models on the right panel. The left models illustrate the [ϕ1, ϕ2] angles and the right models the θ angle. The relation between the two views is a 90° rotation around a vertical axis in the paper plane and an adjustment to align the two central atoms to a Newman projection. Atom '1' is positioned left (left models) and front (right models). The plot was produced with the R package scatterplot3d  and the side panel with PyMol .