Reference

Basics The tour plot
l_tour()	Tour in loon
l_tour_pairs()	Tour Pairs Plot
Layers
New statistical summary layers
l_layer_density2d()	2D density layer
l_layer_hull()	Layer a hull for loon
l_layer_trails()	Display tour path with trails
Layer callback function
l_layer_callback()	Tour Layer Configuration
Useful Accessories
l_getProjection()	Query the matrix of projection vectors
l_getPlots(<l_tour>)	Query a loon widget