Surface densities in double-logarithmic display for point sources with the background subtracted and for three different C − R color intervals: 0.9–1.3 (left panel), 1.3–1.6 (middle panel),1.6–1.9 (right panel). For the blue and the red samples, the power-law indices, valid for the radial range between log(r) = 0.4 and log(r) = 0.9 are indicated. There is no uniform power-law for the intermediate sample. The dashed horizontal lines indicate the backgrounds. The vertical line is an excessively large uncertainty in one bin. Evidently, the inflection point in Fig. 8 is caused by the intermediate sample, which sharply falls off at a distance of 4.5′. We identify this sample with the bulk of intermediate-age clusters.