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