Overview of Stokes I dust continuum emission at different scales. Panel a: previous observations toward B213. Green contours represent the 2 mm dust continuum emission derived from IRAM-30m/NIKA at the contour levels of [2, 5, 10, 20] × 0.068 MJy sr⁻¹ (Bracco et al. 2017). Background grayscale represents the Herschel H₂ column density map. The symbols point to the source positions previously identified with X-ray (red triangles; Güdel et al. 2007), near-IR (NIR: magenta open circle; Cutri et al. 2003), mid-IR (MIR: magenta cross; Cutri et al. 2012), and FIR (blue filled circles; Marsh et al. 2014, 2016), along with a T-Tauri source identified based on NIR-MIR (the red filled square; Davis et al. 2010). Panels b and d: zoom-in images of each source at ∼3000 au scale. Background grayscale and blue contours represent the total intensity of the 1 mm-combine continuum emission, with its contour levels of [3, 8, 30, 100, 300, 500, 700]×89µJy beam⁻¹ in panel b and [3, 8, 30, 100, 300, 500, 700]×116µJy beam⁻¹ in panel d. The magenta contours represent the total intensity of the 3mm continuum, and the contour levels are [5, 10, 50, 200, 400, 600]×17µJy beam⁻¹ in panel b and [5, 10, 50, 200, 400, 600]×18µJy beam⁻¹ in panel d. The blue and magenta ellipses at the bottom left correspond to the synthesized beam of the 1 mm-combine and 3 mm maps in both panels. Panels c and e: zoom-in images of panels b and d at ∼900 au scale. Grayscale and the magenta contours represent the total intensity of the 3mm data, and the contour levels are the same as panels b and d. Yellow contours represent the total intensity of the 1 mm-high continuum, at [5, 10, 20, 100, 500, 1000, 1500, 2000, 2500, 3000]×33µJy beam⁻¹ levels in panel c and [5, 100, 500, 1000, 1500, 2000, 2500, 3000]×28µJy beam⁻¹ levels in panel e. Red and blue arrows represent directions of red-and blue-shifted ¹²CO outflow lobes with position angle of 32◦ for K04166 (Narayanan et al. 2012) and 64◦ for K04169 (Takakuwa et al. 2018). Magenta and yellow ellipses at the bottom left correspond to the synthesized beam of the 3 mm and 1 mm-high maps in both panels. Root-mean-square (rms) values of the contours are listed in Table A.2.