rEDP: Process electron diffaction patterns

#' @name al.edp
#' @aliases al.edp
#' @title electron diffraction profile from Al
#' @description A radial profile from a distortion-corrected
#' electron diffraction pattern from polycrystalline Al recorded
#' at 200 kV with an nominal camera length of 340 mm using a
#' FEI CM20UT and a Gatan 894 UltrascanmCCD camera. The sample
#' was Ted Pella part number 619.
#' @docType data
#' @usage data(al.edp)
#' @format A data frame with 900 observations on the following 2 variables.
#' \code{r.px} A numeric vector containing the radius in pixels.
#' \code{i} A numeric vector containing the radially-averaged raw intensity.
#' @source J. R Minter, recorded 2013-01-15 qm-03796-AlStd-dc-ra.csv
#' @author John Minter, 2013-01-15
#'
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