exportPattern("^[[:alpha:]]+")
importFrom("grDevices", "col2rgb", "rgb", "colorRampPalette", "dev.list", "dev.off", "dev.new", "jpeg", "pdf", "tiff", "png")
importFrom("graphics","abline","axis","legend","segments","curve","lines", "par", "title", "plot","points","box","polygon", "text","mtext","rect","arrows","strwidth","strheight")
importFrom("stats", "na.omit", "qbeta", "runif", "sd")
importFrom("utils", "packageVersion", "tail")
