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Fig. 2

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iz versus rz diagram for the sources in the four QSO fields (small black dots). Primary and secondary z ~ 6 galaxy candidates are marked with red and green dots, respectively. The dashed line represents the adopted threshold of 1.3 in (iz) − σiz used to select primary candidates. A primary candidate in the J1411 field (with iz > 2.82) falls outside the plot. The small black dots above the dashed lines do not match all of our selection criteria (e.g., most of them are detected in the r-band).

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