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Fig. 3.


Map of |Δ α(θ)| over a circular grid |θ|≤2 θE for f2 = 0.55, θc = 0.1 θE and γp = 0.1. We set the radius R of the circular region 𝒰 in such a way that the area of 𝒰 is equal to the area of the square grid used in the pure numerical approach, i.e., . This figure is similar to the Fig. 7 in Unruh et al. (2017) even though it is based on a different approach (see the text for more details). This figure has been obtained with the subpackage spt in less than five minutes for a grid of about 2 × 104 positions.

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