Atomic hydrogen (H I) emission and distribution of the hydrogen volume density (n_H) derived from the Leike et al. (2020) 3D dust reconstruction for two radial velocity and distance channels with the highest V, as indicated in Fig. 4. The pseudovectors indicate the orientation of the T_b and n_H gradients, shown in white and cyan colors respectively. The translucent mask marks the blocks where V < 2.87, thus indicating areas of negligible morphological correlation.