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PACS. 64.70J -Liquid-liquid transitions.Abstract. -Phase separation of COz near its critical point is investigated by optical means. In order to prevent the usual strong gravity-driven flows that overwhelm the process, the experiment is performed under reduced gravity. A pattern of interconnected domains of vapour and liquid is observed whose typical scaled wavelength evolves as in density-matched critical binary liquids. In addition, rapid density fluctuations are observed whose origin is unclear.