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

International Tables for Crystallography (2010). Vol. B, ch. 2.5, p. 368   | 1 | 2 |

Figure 2.5.6.3 

B. K. Vainshteinc and P. A. Penczekg
[Figure 2.5.6.3]
Figure 2.5.6.3

(a) Formation of a backprojection function; (b) projection synthesis (2.5.6.9)[link] is a superposition of these functions.