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

International Tables for Crystallography (2006). Vol. B. ch. 2.3, p. 239   | 1 | 2 |

## Table 2.3.2.2

M. G. Rossmanna* and E. Arnoldb

aDepartment of Biological Sciences, Purdue University, West Lafayette, Indiana 47907, USA, and  bCABM & Rutgers University, 679 Hoes Lane, Piscataway, New Jersey 08854-5638, USA
Correspondence e-mail:  mgr@indiana.bio.purdue.edu

 Table 2.3.2.2| top | pdf | Square matrix representation of vector interactions in a Patterson of a crystal with M crystallographic asymmetric units each containing N atoms
 Peak positions correspond to vectors between the atoms and where is the nth atom in the mth crystallographic asymmetric unit. The corresponding weights are . The outlined blocks I1 and IM represent vector interactions between atoms in the same crystallographic asymmetric units (there are M such blocks). The off-diagonal blocks IIM1 and II1M represent vector interactions between atoms in crystal asymmetric units 1 and M; there are blocks of this type. The significance of diagonal elements of block IIM1 is that they represent Harker-type interactions between symmetry-equivalent atoms (see Section 2.3.2.2).

0,
0,

0,
Block I1         Block II1M

Block IIM1         Block IM