Examples of the detected OCs for the different classes. The blue dots represent the detected member stars for each OC, while the grey dots are field stars queried in the Gaia archive using a cone search within 10 pc radius at the distance of the OC. From left to right, different panels represent: (i) positional distribution in α, δ, (ii) versus distribution, (iii) proper motion diagram, and (iv) the CMD. From top to bottom, different rows are for different OCs: (i) UBC 1023 and UBC 1029 from class A, (ii) UBC 1592 from class B, and (ii) UBC 1628 from class C.