Uncertainty on σint,0, σenv,0, χlum, and χred (from the top to the bottom) as a function of the observational uncertainty σnoise and the number of lines of sight Nlos for an overall extragalactic Faraday depth variance of ≈7.0 rad m-2 (left panels) and ≈0.7 rad m-2 (right panels). The size of the points is proportional to the uncertainty on the parameter. A description of this uncertainty is given also by the grayscale. Circles refer to scenarios including two components, while triangles refer to three-component scenarios. Continuous lines correspond to = const.
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