exportPattern("^[[:alpha:]]+")
importFrom("grDevices", "dev.new", "dev.off", "graphics.off", "topo.colors", "terrain.colors")
importFrom("graphics", "abline", "boxplot", "contour", "image", "lines", "par", "plot", "points")
importFrom("stats", "cor", "median", "optim", "sd")
importFrom("utils", "flush.console")