Spatial distribution of high-redshift galaxy candidates in the field of MRC 0156-252. Blue and red circles show b-YHK and r-YHK, respectively (z > 1.6 candidates; G10). Pink circles show IRAC-selected sources (z > 1.2 candidates; G12). MRC 0156-252 is shown by the green star. Density distribution of the full YHK + IRAC selected sample are shown by the dashed gray contours. The spectroscopic targets are highlighted by open black circles. Four bright, low-redshift galaxies chosen for mask alignment are shown by open black squares. We note that two have colours consistent with IRAC-selected sources which shows the possible contamination of the IRAC selection by low-redshift galaxies.
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