The Slice page allows you to see how the seismic anomaly changes with depth. Choose two points on the map-view of selected depth and press "Go". The server then starts MATLAB, "cuts" the model along the great circle between those two points, makes a plot, and brings it in the additional window on your screen.
You can choose the points by clicking on the image, or by typing the degrees into the corresponding boxes (below the map-view).

choose a model -> ?........?........?...........?

and a depth -> ?......?...........?