Colour − magnitude diagram of the globular clusters around NGC 3311 (after W7W8). Note that the magnitudes and colours are not de-reddened. Objects selected for our spectroscopic survey are represented by large grey dots. Open circles mark those objects for which a slit could be allocated. The 12 cluster members are marked by red triangles, the 2 background objects by blue crosses, and the 6 foreground stars by small black dots.