Fig. 2.
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Comparison of the S/N values obtained using the absolute and relative definition for surface brightness fluctuations, for different spatial scales and in the four regions defined in Table (1). The comparison is made for 100 mock spectra using the best-fit model and the exposure map of A3266, with density fluctuation parameters fixed at σδ = 0.32, ℓinj = 0.05R500 and α = 11/3.
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