International
Tables for
Crystallography
Volume B
Reciprocal space
Edited by U. Shmueli

International Tables for Crystallography (2010). Vol. B, ch. 2.3, p. 262   | 1 | 2 |

Figure 2.3.6.4 

L. Tong,c* M. G. Rossmanna and E. Arnoldb

aDepartment of Biological Sciences, Purdue University, West Lafayette, Indiana 47907, USA,bCABM & Rutgers University, 679 Hoes Lane, Piscataway, New Jersey 08854–5638, USA, and cDepartment of Biological Sciences, Columbia University, New York 10027, USA
Correspondence e-mail:  ltong@columbia.edu

[Figure 2.3.6.4]
Figure 2.3.6.4

Variables ψ and ϕ are polar coordinates which specify a direction about which the axes may be rotated through an angle κ. [Reprinted from Rossmann & Blow (1962)[link].]