Fig. 3
Optical (r-band) image of CL1209 (left-hand panel) and CL3000 (right-hand panel) with superimposed X-ray countours in the [0.5−2] keV band, the latter smoothed with a Gaussian with σ ~ 45 arcsec. The two clusters are among the X-ray faintest for their mass. The circle radius is equal to r500. North is up, east is to the left.
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