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Fig. A.1.

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Histogram of 1 × 105 runs of the Monto Carlo simulation of the NGC 5548 spectrum. The thick black line represents the corresponding power-law fit of the histogram, and the thin black lines show the expected results of 2 × 106 and 5 × 108 simulations. The vertical dashed line marks the observed ΔC-stat = 57 derived with the scan on the observed data using a Gaussian line with σ= 1000 km s−1.

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