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Fig. 1

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FORS U,V,I composite-images showing the investigated region of the Hydra (left) and Centaurus (right) clusters. The two main central cluster galaxies are indicated. For Centaurus, the imaging covers the intra-cluster part between NGC 4696 and NGC 4709, while for Hydra the imaging is centred on NGC 3311. Projected physical scale is about 100 × 100 kpc per FORS pointing in Hydra, and 90 × 90 kpc in Centaurus (assuming a NED distance of 47.8 Mpc to Hydra and 43.2 Mpc to Centaurus).

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