Dust distribution in vertical planes containing the Sun and for longitudes spaced every 10°. The quantity represented is the square root of the differential extinction. The color scale is indicated in Fig. 9. The dotted gray line represents the distance beyond which the final resolution of 25 pc cannot be achieved because there are too few targets (see text). The dashed light gray contours correspond to a differential extinction of 0.003 mag.pc⁻¹. Note the wavy structure throughout the Plane for longitudes 200, 220, and 250°.