The Ramachandran Number: An Order Parameter for Protein Geometry - Fig 8

<p>(a) Coordinate transformation applied to the Ramachandran plot in order to compute the Ramachandran number . A rotation, shift, and rescaling of <i>ϕ</i> and <i>ψ</i> results in a representation in which horizontal cuts run roughly along contours of polymer extension; see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0160023#pone.0160023.g002" target="_blank">Fig 2</a>. (b) The indexing system defined by <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0160023#pone.0160023.e009" target="_blank">Eq (1)</a>, where bold numbers are those that fall on the original Ramachandran plot.