Item _refine.diff_density_rms

Description

              The root-mean-square-deviation of the electron density in the
               final difference Fourier map. This value is measured with respect
               to the arithmetic mean density, and is derived from summations
               over each grid point in the asymmetric unit of the cell. This
               quantity is useful for assessing the significance of the values
               of _refine.diff_density_min and _refine.diff_density_max, and
               also for defining suitable contour levels.

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