The Viking Annotation System
The best way to get a feel for tracing circuits in Viking is to watch this 2.5 minute movie: VikingDemo.mp4
The Viking interface displaying a set of cells in the inner nuclear layer of the retina. Circles mark annotated cells.
The same area, viewed 59 slices deeper in the volume with a red 4-aminobutyrate (GABA) overlay and the EM imagery in cyan.