exportPattern("^[^\\.][[:alpha:]]+")
S3method(plot,tracks)
S3method(aggregate,tracks)
S3method(as.data.frame,tracks)
S3method(as.tracks,data.frame)
S3method(as.list,tracks)
S3method(sort,tracks)
S3method(c,tracks)
S3method('[',tracks)
S3method(as.tracks,list)
importFrom("grDevices", "col2rgb", "rainbow", "rgb")
importFrom("graphics", "abline", "plot", "points", "polygon",
		 "segments", "stripchart")
importFrom("stats", "aggregate", "approx", "ave", "cov", "diffinv", "dist",
		 "hclust", "median", "qf", "quantile", "rnorm", "runif",
		 "sd", "spline", "t.test", "weighted.mean")
importFrom("utils", "head", "read.table", "tail")
importFrom("ellipse", "ellipse")
importFrom("stats", "pf")
