title: A comment on 'A new ray-tracing program RIGTRACE for X-ray optical systems' [J. Synchrotron Rad. (2001), 8, 1047-1050].
abstract: Some points concerning the characteristics of the X-ray simulation code SHADOW [Welnak et al. (1994). Nucl. Instrum. Methods, A347, 344-347] are clarified which are not correctly mentioned by Yamada et al. [J. Synchrotron Rad. (2001), 8, 1047-1050]. It is shown that, contrary to the Authors' statement, some functionality of their new program is not original. In particular, we show that SHADOW can deal correctly with crystal monochromators.
authors.affiliation: Istituto Nazionale di Fisica della Materia, Operative Group in Grenoble, c/o ESRF, BP 220, 38043 Grenoble CEDEX, France. alianell@ill.fr
authors.forename: Lucia
authors.initials: L
authors.lastname: Alianelli
authors.forename: Manuel
authors.initials: M
authors.lastname: Sanchez del Rio
authors.forename: Mumit
authors.initials: M
authors.lastname: Khan
authors.forename: Franco
authors.initials: F
authors.lastname: Cerrina