Data type: numb
Must appear in a looped list containing '_chemical_conn_atom_type_symbol'
Enumeration range: 0 -> infinity
The total number of hydrogen atoms attached to this atom, regardless of whether they are included in the refinement or the _atom_site_ list. This number will be the same as _atom_site_attached_hydrogens only if none of the hydrogen atoms appear in the _atom_site_ list.