An entry in the circular variance map
corresponding to two residues
is the circular variance
calculated using the first residue as reference point
and the residues between the two residues
as the set of points to draw the vectors to
(M. Mezei, A new method for mapping macromolecular topography,
*J. Molec. Modeling and Simul.,*
**21,** 463-472 (2003).).