Data items in the MA_QA_METRIC_DIHEDRAL category capture the analysis of 
      individual torsion angles of a molecule. This analysis may involve dihedral 
      scanning using quantum-mechanical calculations, or a comparison of torsion 
      angle values with probability distributions obtained from experimental data 
      (e.g. TorsionAnalyzer). Here, the main output is not the value from the 
      analysis, but rather a quality classification resulting from an assessment 
      of the energetic state or likelihood of each dihedral angle.