Clusterings of robust prestellar cores in NGC 2068 and 2071 of Orion B, defined mainly using dendrograms. The selected clusters are displayed in different colors, overplotted on the column density map of NGC 2068 and 2071. The left panel shows a bigger cluster (N2 in yellow), where cores were selected within 3 pc distances from one another in a branch of the dendrogram tree around NGC 2068 and 2071 (see text).A similar dendrogram tree is shown in Fig. D.1 for L1622. The middle panel displays subclusters of the N2 group. The cores within these smaller clusters are closer to each other than ~ 1.5 − 2 pc. In the right image, an arbitrary column density level of about 2 × 10²¹ cm⁻² defines a group of cores in the region of NGC 2068 and 2071.