Cluster positions projected onto the Galactic plane. The extinction map from Zucker et al. (2025) is overplotted. Interstellar clouds are shown in yellow, and clear regions are shown in black. The cluster IDs are labeled and color-coded according to their distances using the scale shown on the right. The Sun is marked with a dotted circle, and the clusters, Galactic center, and bulge are located right of this diagram. All the distances are in parsecs. Most clusters have clear lines of sight, largely free from extinction. The exceptions are NGC6405, NGC6281, OCSN95 and OSCN151, that lie behind moderately optically thick dust clouds.