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      --- PropagationSpectrumDampFactor 
      --- PropagationSpectrumDampMode 
      --- PropagationSpectrumEndTime 
      --- PropagationSpectrumEnergyStep 
      --- PropagationSpectrumMaxEnergy 
      --- PropagationSpectrumMinEnergy 
      --- PropagationSpectrumSigmaDiagonalization 
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      --- PropagationSpectrumSymmetrizeSigma 
      --- PropagationSpectrumTransform 
      --- PropagationSpectrumType 
      --- SpectrumMethod 
      --- SpectrumSignalNoise 
      --- TransientAbsorptionReference 
  
    
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    TransientAbsorptionReference 
    
    
    
    
TransientAbsorptionReference 
Section  Utilities::oct-propagation_spectrum  
Type  string 
Default  “." 
 
In case of delayed kick, the calculation of the transient absorption requires
to substract a reference calculation, containing the gauge-field without the kick
This reference must be computed using GaugeFieldPropagate=yes and to have
TDOutput = gauge_field.
This variables defined the directory in which the reference gauge_field field is,
relative to the current folder