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This article has an erratum: [https://doi.org/10.1051/0004-6361/201321150e]


Fig. 18

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Illustration of selection effects. From a single set of around 200 random positions, we are able to construct a false “iSW-like” signal on any desired scale (here for angular radii of 2, 3, 4 and 5°) by selecting and stacking each time the appropriate half of the same set.

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