Torso Signal Manifold: visualizations of left ventricular (LV) sites paced in four groups, labeled by color (center), along with two views of the manifold trajectories (left, right) from the correspondinge torso surface data, with the same correspondence in color labels. Pacing as applied to the inner wall of the LV blood chamber, which is rendered as a gray volume, with pacing sites superimposed (#17 is behind the volume). The two manifold views were rotated to show pacing/trajectory groups more clearly (left: yellow, and right: red, green, blue).