EDP Sciences
The XXL Survey: second series
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Fig. 1


Observed magnitude distribution of all optical objects present in the zDec band catalogue within a radius of 3′′ around eachradio source is shown by the black solid histogram. The expected distribution of background objects in the same area n(m) is shown by the blue dashed histogram. The difference between these two distributions (q(m)) is shown by the red dot-dashed histogram. At magnitudes fainter than z = 23.5 the q(m) histogram has negative, unphysical values.

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