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Fig. 1

image

Outline of the SpARCS fields observable from the northern hemisphere. The blue area traces the distribution of sources detected in SWIRE (with the original data masking applied), while the black squares show the locations of the CFHT individual pointings, each covering approximately 1 deg2. The bottom green squares in the XMM LSS field outline the CFHTLS pointings we use. Pointing centres are marked with black dots.

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