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Fig. 1

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Overall map of the NEP-Wide field. The survey consisted of 446 pointing observations represented by green boxes. Each frame covered a 10′  ×  10′ area with half of its field of view (FoV) overlapped by neighboring frames. The red box and blue lines represent the regions covered by optical surveys at the CFHT and Maidanak Observatory, respectively. The circular gray-shaded region denotes the NEP-Deep field.

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