Overview of the dragon cloud (also known as G028.37+00.07 or Cloud C), the C2 clump (also known as MM4), and the C2cl core region. Left: Three-colour image of the Galactic plane in which the IRDC Cloud C can be seen as a strong dark extinction feature. In this image, red is 8 µm, green is 5.8 µm, and blue is 4.5 µm emission from the Spitzer GLIMPSE survey (Churchwell et al. 2009). Overlaid as coloured contours is the combined near- and mid-infrared extinction-derived mass surface density map, in levels of 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.375, and 0.45 g cm⁻² (Kainulainen & Tan 2013). Center top: ALMA 1 mm dust continuum at 0.8″ resolution (Liu et al. 2020), overlaid with contours of 0.084, 0.14, 0.28, 0.56, 1.4, 2.8, and 4.2 mJy beam⁻¹. Centre bottom: ALMA 3 mm dust continuum taken from ALMA-IRDC at 3″ resolution (Barnes et al. 2021), overlaid with contours of 0.49, 0.81, 1.13, 1.46, and 2.43 mJy beam⁻¹. Right top: Zoom in on the high-resolution 1 mm continuum image taken with only the longest baseline configuration, overlaid with contours of 0.4, 0.6, and 1.2 mJy beam⁻¹. Right center: ALMA 1 mm dust continuum with a circularised 0.4″ beam, which was used for the dendrogram analysis. The dashed black contours indicate the boundaries of the identified cores, whilst the orange ellipses show the intensity-weighted second moment along the two spatial dimensions within the contour (e.g. Rosolowsky et al. 2008). Right bottom: Same 1 mm observations imaged with a robust −2 (close to uniform) weighting scheme to maximise the resolution (0.24″ × 0.19″, or ~0.05 pc), overlaid with contours of 0.4, 0.6, 1.2, 2.5, 4, and 5 mJy beam⁻¹ (solid black line). Shown on the right of the ALMA observation panels is the beam size, and a scale bar is shown in the lower left of all panels.