Computer-generated 3-D reconstruction from case D46, after injection of BDA and FR into SI whisker barrels located within the same row (A). The clusters of labeling are co-localized and display an inside-out relationship, with the red dots surrounding the black dots externally, i.e. laterally (B: ventral view, C: slices 40 - 80), medially (B, ventral and rostral views, C: slices 50 - 60, D: slices 10 - 20) and dorsally (C: slices 70 - 80, D: slices 50 - 80). This case is documented in Leergaard et al., 2000b.