i − z versus r − z 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 (i − z) − σi − z used to select primary candidates. A primary candidate in the J1411 field (with i − z > 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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