The behavior of power spectra in a Rayleigh-B\'enard convection experiment in a helium-gas cell is reported. The high-frequency part of the data for all Rayleigh numbers from 7×{}10⁶ to 4×{}10¹⁴ is fit by a single functional form, obtained by a natural generalization of a multifractal analysis. Low-frequency data cannot be fit in this form.
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Wu et al. (1990) studied this question.
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