Fig. 1

The MUSYC R-band images. The circles (3 arcsec radius) show the MIPS positions. X-ray sources are denoted with crosses, preferring the CDFS 2 Ms positions to the eCDFS, in cases where a source is detected in both surveys. The images are centred on the LABOCA positions and their size is 25 arcsec. The number at the top left of each image is the LABOCA identification.
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