Two-dimensional histograms of simulated WCI, RBI for the C IV emission line. These indices were measured from simulated line profiles that arise from the BLR models KD, PW, and EW seen at inclinations 22°, 34°, 44°, and 62°. The BLR models with an emissivity ϵ₀ (r_in/r)^q that sharply decreases with radius, i.e., q = 3, are illustrated in the left panel, while those that are characterized by a more slowly decreasing emissivity, i.e., q = 1.5, are illustrated in the right panel. Each model also contains a continuum-emitting disk seen under the same inclination. All continuum source radii and BLR sizes used in the simulations are considered, but only the models that reproduce the μ^cont and μ^BLR values measured for the C IV emission line are shown, i.e., 2.8 ≤ μ^cont ≤ 3.3 and 2.24 ≤ μ^BLR ≤ 2.78 (Table 1). The color map is logarithmic. The WCI and RBI values measured for C IV are plotted with their uncertainties as a small rectangle superimposed on the simulated WCI, RBI distributions.