Enlarged region of the Hydra I cluster centred on the core. N is up, and E is left. NGC 3311 and NGC 3309 dominate the cluster centre, while NGC 3312 is visible in the SE. This is member of the SE group. Another two bright galaxies in the core, NGC 3308 and NGC 3307, are also marked in the image. The dashed red contours indicate the X-ray emission from XMM (Hayakawa et al. 2004, 2006). The dashed blue circle marks the outermost radius of 14 arcmin ∼220 kpc, where the surface brightness profiles are mapped, down to μ_g ∼ 28.5 mag/arcsec², in the g band. The image is 30.5 × 23.0 arcmin² wide.