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Fig. 5

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The SDSS catalogues used. We show a six-degree thick slice drawn from the catalogues used in our analysis. The red points are the LRG galaxies, which form a nearly volume-limited sample at z > 0.15. The “main” galaxies of the SDSS are depicted in blue. As shown, we use the “main” galaxies from z > 0.09, and we use only the LRG in an inner volume, allowing for a buffer region of rbuff = 175   h-1   Mpc from any of the borders of the “main” sample volume. For our analysis, we use the samples covering a total area of 5511deg2. The radius of a typical BAO shell is shown as a segment. At the top insets, we show two orthogonal slices of width 20   h-1   Mpc, centred on a particular LRG. The BAOlet coefficient map WR,s(x) has a large value at the position of this centre (for Rmax,smax), thus we expect to find a strong BAO signal. The two circles have the radii of 100 and 110 h-1   Mpc, respectively. This is a single BAO shell where the over-density can be appreciated by eye on the right scale.

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