2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/25712We measure the spatial correlation function of Bose-Einstein condensates in the cross-over region between phase-coherent and strongly phase-fluctuating condensates. We observe the continuous path from a gaussian-like shape to an exponential-like shape characteristic of one-dimensional phase-fluctuations. The width of the spatial correlation function as a function of the temperature shows that the condensate coherence length undergoes no sharp transition between these two regimes.8 pages, 6 figure, submitted to EPJDSoft Condensed Mattertext