Colour–magnitude diagrams of the final GC samples for Centaurus (left) and Hydra (right). The individual data points in the top and bottom plot are the same. In the bottom plots additional filled circles in blue and red indicate the median colours between the black limiting curves at extreme colours and the (green) fixed dividing line between the blue and red peak. The blue and red lines indicate least squares fits to the median colours as a function of magnitude.
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