  We try to apply the cosmic crystallography method of Lehoucq, Lachieze-Rey,
and Luminet to a universe model with closed spatial section of negative
curvature. But the sharp peaks predicted for Einstein-de Sitter closed models
do not appear in our hyperbolic example. So we turn to a variant of that
method, by subtracting from the distribution of distances between images in the
closed model, the similar distribution in Friedmann's open model. The result is
a plot with much oscillation in small scales, modulated by a long wavelength
quasi-sinusoidal pattern.
