Ratio between the blue and red populations of globular clusters. We considered radial bins of 0.167 arcmin, as in the radial density plots. The plot shows the ratio of blue to red clusters (N_blue/N_red) as a function of the distance from the center of the galaxy (r). The diamonds represent data not included in the study in order to avoid incompleteness effects in the innermost bin. The line shows the result of the linear fit to the data.