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Generates color scale matching the one normally used to display the Planck CMB temperature map from -300uK to +300uK.
planckcolors(n)
Returns an n-vector of RGB colour strings.
integer number of colors in the scale
Danail Obreschkow
#' @examples nplot() rasterImage(rbind(planck.colors(1e3)),0,0,1,1)