2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/5487The cosmic crystallography method of Lehoucq et al. [1] produces sharp peaks in the distribution of distances between the images of cosmic sources. But the method cannot be applied to universes with compact spatial sections of negative curvature. We apply to these a second order crystallographic effect, as evidenced by statistical parameters.14 pages, 9 figuresAstrophysicsGeneral Relativity and Quantum Cosmologytext