Inset zoom figures of the B3 (top) and B6 (bottom) images of W51-E. The insets highlight the regions shown in detail in Figure H.12. The central region, containing W51 e1 through e10, is shown in both insets. W51 e1/e8 is the southern part of this region, shown in Fig. H.12a. W51 e2 is the northern part of this region, shown in Fig. H.12b and c. The diffuse HII region W51 Main shown as a zoom panel to the right of the top figure showing the B3 image; its spectral index map is shown in Fig. H.12d.