#' @title Spectral transmittance for glass windows
#'
#' @description Indexing vector for extracting transmittance spectra for
#' window glass panes from object \code{filters.mspct}.
#'
#' @details A character vector of names of members of the collection of spectra.
#'
#' @note The spectral data for these glasses is taken from file
#' \url{http://files.cie.co.at/206.xls}, downloaded 2017-06-25. Abbreviated
#' names from the original .xls file used as member names. Full glass names,
#' thickness and manufacturers names, retained and stored as metadata in
#' attribute "what.measured".
#'
#' @docType data
#' @keywords datasets
#'
#' @format A vector of character strings.
#'
#' @examples
#'
#' glass_windows
#' summary(filters.mspct[glass_windows])
#' summary(filters.mspct[glass_windows[grep("Pilkington", glass_windows)]])
#'
"glass_windows"
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