Fig. 6
Two problematic matching cases, which were a posteriori recovered by visual inspection. The SDSS colour 7′ × 7′ image is overlaid on the raw X-ray photon image + contours (the X-ray image is not corrected for detector cosmetic); the optical and X-ray centres are marked by a white and a red cross, respectively. Left: wrong optical centre; the offset between the redMaPPer and X-ray centres is 2.2′. Right: complex nearby structure; the offset between the two centres is 1.7′.
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