X-ray-optical overlay of the example cluster 2XMM J102133.2+213752 at spectroscopic redshift =0.1873. The X-ray flux contours (0.2−4.5 keV) are overlaid on a combined image from r, i, and z-bands SDSS images. The plotted cyan circle has a radius of one arcmin around the X-ray emission peak. The field of view is 4′ × 4′ centred on the X-ray cluster position.
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