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         section   1         Introduction                    cif
    ; X-ray diffraction from a crystalline material provides
      information on the thermally and spatially averaged
      electron density in the crystal...
    ;
         section   2         Theory                          tex
    ; In the rigid-atom approximation, the dynamic electron
      density of an atom is described by the convolution
      product of the static atomic density and a probability
      density function,
      $\rho_{dyn}(\bf r) = \rho_{stat}(\bf r) * P(\bf r). \eqno(1)$
    ;

 
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         section     3
    ; The two-channel method for retrieval of the deformation
      electron density
    ;
         .
         subsection  3.1  'The two-channel entropy S[\D\r(r)]'
    ; As the wide dynamic range involved in the total electron
      density...
    ;
         subsection  3.2
    'Uniform vs informative prior model densities'        .
         subsubsection  3.2.1  'Use of uniform models'
    ; Straightforward algebra leads to expressions analogous
      to...
    ;