Dependence between EW(Mg II) and local cloud density, nH, BLR radius, Rin, and the hydrogen column, NH, with respect to the fiducial values 1011 cm-3, 1018 cm, and 1023 cm-2 obtained with CLOUDY for the broad band continuum from Fig. 2, for four values of the turbulent velocity (10 km s-1, blue, 100 km s-1, red, 500 km s-1, magenta, 1000 km s-1, black), and three values of the covering factor (1.0, circles; 0.3, triangles; 0.1, squares). Dashed horizontal lines mark the minimum and the maximum value from Table 4.
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