exportPattern("^[[:alpha:]]+")
importFrom("graphics", "plot", "points", "segments", "polygon", "text", "arrows")
importFrom("stats", "approx", "smooth.spline", "sd")
importFrom("utils", "combn")
importFrom("rgl", "plot3d", "arrow3d")
importFrom("Matrix", "solve")
S3method(plot, colourvision)
S3method(plot3d, colourvision)
