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Fig. 1

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Observed 2–10 keV X-ray versus [O IV] line luminosity. Blue stars represent Sy1s (Sy 1.0–1.5), red circles Sy2s (Sy 1.8–2.0). Filled symbols are masers, open symbols are non-masers. The dotted lines mark fixed LX/L [O IV]  ratios of 1000; 100; 10; 1; 0.1 (from top to bottom). The error-bar in the lower right corner is the average relative error of all [O IV] measurements.

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