Upper figure: comparison between the normalized MDF of stars (dotted) and GCs (full lines) in three distance regions of Cen A. Each MDF is normalized to 1. Lower figure: logarithmic ratio between the normalized MDFs of clusters and stars as a function of [M/H] in bins of Δ [M/H] = 0.30. The colours are the same as in the upper figure. For clarity, the points of the three regions are slightly horizontal shifted with respect to one another. The coloured dotted lines show the weighted least square fits of the three distance regions. The full black line is the least square fit of the three regions combined. It has a slope of −0.78 ± 0.05.