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Ahlers describe a new effect, that they interpret as non-Boussinesq, in a convection cell working with ethane, near its critical point. They argue that such an effect could have spoiled the Chavanne {\\it et al.} (Phys. Rev. Lett. {\\bf 79} 3648, 1997) results, and not the Niemela {\\it et al.} (Nature, {\\bf 404}, 837, 2000) ones, which would explain the differences between these two experiments. 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