postscript acrobat T. Frese, C. A. Bouman, and K. Sauer, ``Multiscale Bayesian Methods for Discrete Tomography,'' {\em Discrete Tomography: Foundations, Algorithms and Applications,} edited by Gabor T. Herman and Attila Kuba, pp. 237-261, Birkhauser Boston, Cambridge, MA, 1999.