Fig. 1
Location of the GMASS field (greyscale, Ks band) compared to other fields (K20, dashed) and instrument imaging (UDF NICMOS and ACS, diamonds; GOODS ISAAC, dotted; GOODS IRAC, large rectangular, with Epoch 1 indicated) coverages. The GMASS field was chosen to be inside the IRAC Epoch 1 and ISAAC imaging, covering as much as possible of the UDF and K20 field. North is up, east to the left.
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