Panel a, main panel: stacked CMASS galaxy number density map for 1 million galaxy pairs, convolved with a Gaussian filter with FWHM 10 arcmin and normalised by the peak value of the stacked map. Left and upper side-panels: mean radial profile and horizontal profile respectively, and include the modelled contributions from the primary halo (blue dashed lines), secondary (green dash-dotted line) and the two haloes combined (pink solid lines). Panel b: residual between the stacked map and two isotropic halo profiles. Upper side-panel: residual profile extracted from the boxed region, with dashed lines indicating the galaxy pair centres. The residual haloes in the filament region are estimated to contribute approximately 20% of the filament signal.
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