  We present a detailed analysis of the spatial distribution of the stellar
populations in the Galactic globular cluster omega Centauri. Taking advantage
of the large photometric catalog published by Pancino et al. (2000), we confirm
that metal-rich populations have a spatial distribution which is significantly
different from the metal-poor dominant population. In particular: (i) the
different sub-populations have different centroids and (ii) the metal-poor
population is elongated along the E-W direction, while the metal-rich
populations are oriented along the orthogonal direction, i.e., N-S. The
evidence presented here can partially explain the weird spatial metallicity
segregation found by Jurcsik (1998), and further supports the hyphothesis that
different sub-populations in omega Centauri might have had different origins.
