#' Mean and standard deviation of sources
#'
#' A dataset of PM2.5 source mean/SD in referent constituent
#' units (e.g., units of Silicon)
#' The variables are:
#'
#' \itemize{
#' \item source. Source name
#' \item type. Simulation type (ambient, local1 - local4)
#' \item mean. Normal mean for each source
#' \item sd. Normal standard deviation for each source
#' ...
#'}
#'
#' @docType data
#' @keywords datasets
#' @format A dataframe with 19 rows and 4 variables
#' @name meansd
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