Five examples of the 53 detected OCs. The blue dots represent the detected members, while grey dots represent field stars. Leftmost plots: position of the OC in (α, δ). Inner left plots: (μ_α^*, μ_δ) distribution, whilst inner right plots: (ϖ, μ_α^*) distribution. Rightmost plots: CMD of each OC. The plotted OCs are, from top to bottom: UBC 54, UBC 56, UBC 57, UBC 60, and UBC 90. The first four clusters are class A and the last one is a class B cluster (see Table 1).