RGB composite image showing: the 3D dust map integrated between 300 and 500 pc in blue colours and contours as in Fig. 2. The ²⁶Al emission map from Diehl (2002) is shown in red colours and contours. Red contours are between 2.8  ×  10⁻⁶ and 2.4  ×  10⁻⁴ cm⁻² sr⁻¹ s⁻¹ in steps of 2.7 × 10⁻⁵ cm⁻² sr⁻¹ s⁻¹. The Orion-Taurus ridge is shown with white contours as in Fig. 1; the N_H2 map from Kalberla et al. (2020) is in green colours and contours between 6.3 × 10²⁰ and 10²² cm⁻² in log₁₀-steps of 0.2. The yellow circles are the same as in Fig. 2.