pbratios: Processing Pb isotope ratio data

#' Raw csv report with Pb isotope ratio data.
#'
#' This raw report was obtained saving as csv the original .rep file produced by the mass
#' spectrometer Perkin Elmer ELAN ICP-MS. This file is an example of \bold{short} report.
#'
#' Field separator are "," and decimal separator are ".". Standards with known Pb isotope ratios are
#' used to correct the instrumental mass bias by the bracketing standard technique and are labelled
#' as \code{SRM}. QC data are BCR CRM 482 and are labelled as \code{CRM}. Sample data refer to size
#' fractionated sediment samples collected in the coastal marine enviroment of Kongsfjorden
#' (Svalbards, Norvegian Arctic) in 2014.
#'
#' @name sednya_2015
#'
#' @format The file has 1568 rows and 7 columns.
#'
#' @author Andrea Bazzano, Francesco Soggia and Marco Grotti.
#'
#' @source A selection of the processed data were submitted as: Grotti, Soggia, Ardini, Bazzano,
#'   Moroni, Vivani, Cappelletti and Misic, Trace elements in surface sediments from Kongsfjorden,
#'   Svalbard: occurrence, sources and bioavailability. International Journal of Environmental
#'   Analytical Chemistry, 2017, submitted.
#'
#' @examples
#' file.short <- system.file("extdata", "sednya_2015.csv", package = "pbratios")
#' sednya.2015 <- extract_data(file.short, report = "short")
#'
#' @seealso \code{\link{extract_data}}
#'
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