Multi-coloured integrated intensity maps of the ¹³CO (2–1) emission in an inset of the ‘G009’ SEDIGISM field. Clouds attributed to a given spiral arm are colour-coded: magenta (3 kpc), red(Norma-Outer), blue (Scutum-Centaurus), green (Sagittarius-Carina), yellow (Perseus), grey (inter-arm or unreliable distance clouds). For visualisation purposes, in these images, we include also clouds attributed to the 3 kpc arms and with uncertain location, even if they are not used in further analyses. The same images for the full survey are collected in Appendix E.