Dark and bright sides of the Broad Line Region clouds as seen in the FeII emission of SDSS RM 102

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Fig. 3.

Contour plots for the R_opt ratio described in Sect. 3.3 with constant V_turb = 0 km s⁻¹, Z=Z_⊙, and equal contributions from the bright sides and the dark sides of clouds. The position in the parameter space corresponding to the ratio measured in RM 102 is marked by a solid red line, while the dashed red line represents the 1-σ confidence range of the ratio.

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