Fig. 1

Scattering geometry for a molecular cloud located in front or behind the Sgr A* plane. The two positions result in the same effective scattering and polarization degree. In this scheme, dproj is the cloud-Sgr A* distance projected in the plane of the sky, dlos is theline-of-sight displacement of the cloud with respect to the Sgr A* plane, c is the speed of light, tlight is the light travel time between Sgr A* and the cloud, θ and π − θ are the two possible scattering angles.
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