Distribution of the sample clusters on the plane of the galactic disk (left). Each circle represents a sample cluster, with its size proportional to the MD of the sample, and its color is coded according to the members’ number of the sample clusters. The different colored dashed lines indicate the positions of the local arm detected by different types of tracers, the data involved was from Hao et al. (2021). Distribution of the sample clusters on the profile map of the disk (right). Each circle represents one cluster, with its size being proportional to the cluster’s MD and its color coded according to the cluster’s ER. The dot-dashed line denotes the mid-plane (Z ≥ −20.8 pc) of the disk.