handles: HANdles Detection Limits when Estimating Sources

#' PM2.5 chemical constituent concentrations in New York City
#' 
#' A dataset of PM2.5 constituent concentrations from the
#' Queens College monitor in New York City from the New York
#' State Department of Environmental Conservation from
#' April 2001-December 2002.  The data contains concentrations 
#' for 30 chemical constituents of PM2.5.  The variables are:
#' 
#' \itemize{
#' 		\item Date. date of observation
#' 		\item PM25. total mass PM2.5 concentration in mug/m^3
#' 		\item aluminum. concentration of aluminum in mug/m^3
#'		...
#'}
#'
#' @docType data
#' @keywords datasets
#' @format A data frame with 174 rows and 32 variables
#' @name nydat
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