Left: reproduction of the Gaia Collaboration (2023a) OB stellar overdensity map. Centre: dust overdensity (this work) shown with the same Galactic coordinate system for direct comparison. Right: greyscale dust overdensity overlaid with coloured contours of OB stellar overdensity. The red contours highlight regions where stellar features coincide with low-dust zones (white in the background), while the blue contours trace apparent stellar ‘gaps’ that align with high-dust concentrations (dark grey to black in the background).