#' Stream Water Quality
#'
#' Mayfly nymph counts in small streams above and below an industrial outfall.
#'
#'
#' @name MayflyNymph
#' @docType data
#' @usage MayflyNymph
#' @format Data frame with 12 rows and 2 columns\cr
#' \tabular{lll}{
#' Name \tab Type \tab Description\cr\cr
#' Above \tab integer \tab Mayfly nymph counts above
#' the industrial outfall\cr
#' Below \tab integer \tab Mayfly nymph counts below
#' the industrial outfall\cr
#' }
#' @references Helsel, D.R. and Hirsch, R.M., 2002, Statistical methods in
#' water resources: U.S. Geological Survey Techniques of Water-Resources
#' Investigations, book 4, chap. A3, 522 p.
#' @source Table 6.1 in Helsel and Hirsch (2002).
#' @keywords datasets
#' @examples
#'
#' data(MayflyNymph)
#' # Compare the counts above and below the industrial outfalls
#' boxplot(MayflyNymph, range=0, log='y')
#'
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