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Comment on "Turbulent heat transport near critical points: Non-Boussinesq effects" ( cond-mat/0601398 )

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Figure

FIG. 1: Phase diagram of 4 He in reduced units (T c = 5.1953 K, ρ c = 69.641 kgm − 3 ) showing the location of various  mea-surements of N u versus Ra
FIG. 2: The compensated Nusselt versus the Rayleigh num- num-ber. Circles: FA results as presented in their figure 5 (open:

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