Table 6: CLOUDY models for the three quasars: (1) $U=\frac{Q(H)}{4\pi r^{2} n c}$ where Q(H) is the number of hydrogen ionizing photons, r is the distance of the gas to the continuum source, n is the gas number density and c the speed of light.
Para PG PG PG
meter 1001+054 2112+059 1535+547
$N_{\rm H}$ [ ${\rm cm}^{-2}$] 1023.3 1022.8 1022.5
$\rm U^{(1)}$ 102.7 101.7 101.8
$\alpha_{\rm OX}$ -1.72 -1.63 -1.72
$\alpha_{{\rm UV}}$ -0.5 -0.5 -0.5
$\alpha_{{\rm X}}$ -0.95 -0.95 -0.95


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