RMS for NGC 7027 for all bands before (top) and after (middle) fringe flat correction and after residual fringe correction (bottom) averaged over the 16 spaxels. The various metrics are the standard deviation of the full spectrum (blue), the standard deviation of the binned spectrum (pink), the tops RMS (orange), and the RMS derived from the main peak of the periodograms (green). The error bars indicates the dispersion of these quantities among spaxels and, for the periodograms, among the four values of N.