Location of clusters selected for further analysis from NGC 628 in color–color plots. Left: Color–color diagram used for the selection of clusters close to the A2 SMS+Cluster model. Right: Color–color plot for the selection of clusters close to the B3 SMS+Cluster model. Class 1 and Class 2 objects are shown in yellow points while clusters with mass > 10⁵ M_⊙ are shown by green squares. Yggdrasil models with solar metallicity and different covering factors are shown as blue (f_cov = 1), black (f_cov = 0.5), and green (f_cov = 0) lines (f_cov is important only at young ages (< 10 Myr) and all three models will be the same at older ages and are therefore seen as a single black line). The model cluster is shown as a large green dot. Different SMS+Cluster and SMS models are shown in red (A2), blue (A4), and magenta (B3) triangles and stars, respectively. Clusters close to the A2/B3 SMS+Cluster models within the 2 × photometric error + reddening limit are shown in the magenta box. The reddening vector is shown in the top right corner of the plot. The length of the reddening vector corresponds to E(B − V) = 0.2 with the Milky Way extinction law (Cardelli et al. 1989). All the magnitudes and colors are given in the AB magnitude system.