Images of artificial star clusters of various ages and masses in the B0 (left) and B3 (right) fields. The cluster mass is indicated below each column, and the age is noted to the left of each row. All clusters were generated using r_c = 0.2″ and γ = 2.8 parameters. The corresponding CBR values (see definition in Sect. 5.2) determined in the B3 field are indicated above the image pairs. Magenta circles mark apertures used to measure CBR values. The colour images (5″×5″) were produced by combining F336W, F475W, and F814W data.