export(GGEBiplot)
import(rgl,tkrplot,tcltk) 
importFrom("grDevices", "bmp", "chull", "dev.off", "jpeg", "pdf",
             "pictex", "png", "postscript")
importFrom("graphics", "abline", "arrows", "par", "plot", "points",
             "polygon", "segments", "symbols", "text")
importFrom("stats", "var")
importFrom("utils", "write.table")

