#' @name esigfigs
#' @docType data
#' @title How many signif digits to show
#' @description How many sig figs to show in showing environmental indicators in EJSCREEN?
#' @usage data('esigfigs')
#' @source See related Technical Documentation at \url{http://www.epa.gov/ejscreen}
#' @seealso \code{\link{make.popup.e}}
#' @format A data.frame: \cr\cr
#' > str(esigfigs) \cr
#' 'data.frame': 12 obs. of 2 variables:\cr
#' $ sigfigs: num 3 3 2 2 2 3 2 2 2 2 ...\cr
#' $ evar : chr "pm" "o3" "cancer" "neuro" ...\cr\cr
#' sigfigs evar\cr
#' 3 pm\cr
#' 3 o3\cr
#' 2 cancer\cr
#' 2 neuro\cr
#' 2 resp\cr
#' 3 dpm\cr
#' 2 pctpre1960\cr
#' 2 traffic.score\cr
#' 2 proximity.npl\cr
#' 2 proximity.rmp\cr
#' 2 proximity.tsdf\cr
#' 2 proximity.npdes\cr
#' 2 ust
#'
NULL
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