Dendrogram source extraction results of four sources. Left: dendrogram identified multi-level structures overlaid on the SABOCA emission map. Leaves originating from the same top branch structures are marked with the same color (in red, blue, cyan, or magenta) as contour lines. Leaves with brown color are isolated leaf structures, i.e., with no parental structure in the emission map. Orange ellipses are the corresponding schematic ellipse calculated based on the intensity weight. Branches that do not intersect with the map edge, i.e., with closed contours as defined in the text, are marked with lime contour lines. Right: dendrogram tree plot representation of the left panel. Similarly, leaves from same top branch are marked with same color as in the left panel. The horizontal dotted line indicates the 3σ threshold we used for the minimum level as input parameter of the dendrogram identification.