International
Tables for
Crystallography
Volume C
Mathematical, physical and chemical tables
Edited by E. Prince

International Tables for Crystallography (2006). Vol. C. ch. 4.3, p. 422

Figure 4.3.8.4 

J. C. H. Spencel and J. M. Cowleyb
[Figure 4.3.8.4]
Figure 4.3.8.4

The contrast of few-beam lattice images as a function of focus in the neighbourhood of the stationary-phase focus [see Olsen & Spence (1981[link])].