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Item _em_2d_crystal_entity.space_group_name_H-M

Description

     The 17 plane groups are classified as oblique, rectangular, square, and hexagonal. 
      To describe 2D crystals of biological molecules, 
      the plane groups are expanded to their equivalent noncentrosymmetric space groups.
      The space group setting is chosen such that the 2D crystal plane 
      corresponds to the 'ab' plane of the space group. 
      .   
      Enumerated space group descriptions include the H-M plane group symbol 
      and plane group class. 

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