Ratio of the number of UV-red to UV-blue stars as a function of distance from the cluster center, for the seven clusters in which we detected a significant intrinsic UV-s. The radial coordinate is expressed in units of cluster core radii, the dashed vertical lines marks the radial distances corresponding to 1−5 half-light radii (r_c and r_h from Harris 1996). The ratio is computed in radial bins 2.5′ wide in steps of 0.5′. Note that the actual value of the ratio depends on the adopted threshold between UV-red and UV-blue stars: here we adopted as in Table 2 and Fig. 4.