²⁶Al-longitude-LoS velocity diagram of the same disk gas particles of Figure 2, as seen from the location of the Solar System (i.e., the red circle in Figure 2), color-coded according to their ²⁶Al content (in log (gram) unit). Black dots with error bars show the ²⁶Al detection data by the INTEGRAL/SPI instrument (Kretschmer et al. 2013) and Karsten Kretschmer, personal communication. The dashed vertical lines highlight the region between the viewing angle −40 ≤ ϕ ≤ −14, corresponding to the dashed lines in Figure 2, showing the deviation discussed in the text.