Differential reddening corrected CMD of UBC 274 with isochrone and ZAMS. Dots with different colors are cluster members with different membership probabilities, but all have P_memb ≥ 0.5. Triangles and squares are respectively the BS and pBS identified in this work. Red solid and dashed lines are the best fitting isochrone and ZAMS, respectively. The derived parameters of UBC 274 from the best fitting isochron are log(t) = 9.45, Z = 0.011, DM = 11.5, E(G − RP) = 0.07.