exportPattern("^[[:alpha:]]+")
importFrom("grDevices", "as.raster")
importFrom("graphics", "locator", "plot", "plot.new", "rasterImage","rect")
importFrom("stats", "fft", "sd","ccf","runif")
importFrom("graphics", "legend")
importFrom("signal", "butter","filtfilt","filter")
importFrom("graphics", "points")
