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Fig. 10

image

Sketch for the path length through the emitting volume of a relic. The width of the downstream volume is given by the cooling time of the electrons. The green line indicates the line of sight with the maximum path length through the emitting volume. d is the intrinsic width and ΔR the observable width of the relic (see Table 1). For dRcc the maximum path length can be approximated by .

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