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Fig. 19.

image

Error-normalised position offsets between sources in the stacked catalogue and associated quasars in SDSS-DR12 compared to a Rayleigh distribution (red). Light blue: Based on the one-dimensional purely statistical position errors RADEC_ERR/ given in the catalogue. Black: Using the best-fit additional error component 0.43″, linearly added to the statistical error on the X-ray position.

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