UGR color–color plot for galaxies in our sample between 2.6 < z < 3.6. Filled and open circles represent respectively targets and serendipitous objects with optical counterpart. Black points show galaxies at all redshifts. The dashed box indicates the drop-out region in which galaxies at such redshifts are expected to lie. The cross in the bottom right part of the diagram shows the typical error bars.
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