Position and extent of the SCIMES cloud complexes only (left), and all the clouds (right), i.e. the molecular cloud complexes plus all the well resolved single-leaf clouds, in ℓb (top) and ℓv space (bottom). The colour-coding refers to the ID number of the clouds as per our catalogue, and relates to the third dimension of the cube (i.e. v_lsr). The coloured masks of the clouds are overplotted with transparency over the maps of the peak ¹³CO(2−1) emission, in grey scale (see the transparency-combined scale on the right).