ALMA 3 mm continuum. In each panel, the continuum data of the region are shown in color and black contours. The dotted black contour marks the −5σ_cont level. The solid black contours start at 5σ_cont, and contour steps increase by a factor of 2 (e.g., 5, 10, 20, 40σ_cont). The synthesized beam size is shown in the bottom-left corner. The bar in the top-left corner indicates a linear spatial scale of 0.1 pc. The continuum noise and synthesized beam size are listed in Table 2. The continuum fragments are classified into dust cores (red), dust+ff cores (orange), and cometary UCHII regions (cyan), further explained in Sect. 4.1. Fragments with S/N < 15 are not analyzed in this study and are labeled in gray.