RGB color images of a representative sample of the newly discovered cluster candidates. The field-of-view for the chart of each cluster is set variously between 1 × 1 arcmin, 3 × 3 arcmin, and 5 × 5 arcmin in order to visualize the cluster comfortably. This set of clusters are the same shown in Fig. 9. The complete set of charts for the whole catalog is offered on the catalog website, see details in Sect. 3.