exportPattern("^[[:alpha:]]+")
import(ggplot2, gridExtra, rgl, sphereplot, plot3D, RColorBrewer, colorRamps)
importFrom("graphics", "plot", "title")
importFrom("grDevices", "gray", "rainbow")
importFrom("graphics", "hist")
importFrom("stats", "ecdf", "frequency")
importFrom("utils", "tail")
