Simulations of the scattering intensity of closely packed polydisperse spheres have recently been presented by Bertram [J. Appl. Cryst. (1996), 29, 682–685]. In the present Comment it is pointed out that the approach used by Bertram for the simulation does not give configurations which are representative of the thermodynamic equilibrium state. Bertram compared his results with an expression, claimed by Bertram to be an alternative to the `local monodisperse' approximation previously presented by Pedersen [J. Appl. Cryst. (1994), 27, 595–608]. Bertram's expression is in fact identical to the `local monodisperse' approximation.
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Jan Skov Pedersen (1998) studied this question.