Selection of transverse position-velocity diagrams (PV_⊥) formed perpendicularly to the axis at separation y = $5_{\cdot }^{\mathrm{\prime }\mathrm{\prime }}0$ $6_{\cdot }^{\mathrm{\prime }\mathrm{\prime }}0$, and $7_{\cdot }^{\mathrm{\prime }\mathrm{\prime }}5$ from the source, and with orientation PA=318° (i.e., positive offsets toward the NW). The curves indicate the corresponding substructures in Fig. 4 and 5, labeled with the same name. The points of intersection of a given curve with the x = 0 axis can easily be found in the other orthogonal projections of the datacube. For example, the point in the PV_⊥ at y =$7_{\cdot }^{\mathrm{\prime }\mathrm{\prime }}5$ indicated by the red star, lying on substructure B2 at (x =0, V_LSR= 18 km s⁻¹), is found in the PV_∥ of Fig. 5 along the trace B2 at (y =$7_{\cdot }^{\mathrm{\prime }\mathrm{\prime }}5$, V_LSR= 18 km s⁻¹), and in the channel map for V_LSR= 18 km s⁻¹, at the intersection of the arc B2 with the axis, located at y =$7_{\cdot }^{\mathrm{\prime }\mathrm{\prime }}5$ from the source.