FUV/NUV images with H i surface density contours superimposed. The contours shown correspond to H i surface density levels of log Σ_HI(M_⊙ pc^-2) =  −1, −0.5,0,0.5 and 1. The H i beam is shown as an ellipse in the top-left corner of each panel. The horizontal bar in the bottom-right corner of each panel indicates a scale of 1 arcmin (or 4.9 kpc at the assumed cluster distance of 17 Mpc). The arrow indicates the direction of the cluster center.