The geometry used in determining the normalisation for the APEC modelling of the radio relic regions (Eq. (5)). Rcc corresponds to the distance between the relic and the cluster center as projected on the sky. Rl is the relic largest linear size and Rw is the relic width. For relics that are classified as roundish by Feretti et al. (2012) we use Rw = Rl. φ is given by . In result, the dashed curve is the solid angle over which we integrate. The relic image, corresponding to the so-called Sausage, is adapted from Röttgering et al. (2013).
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