Definition:
The Cromer-Mann scattering-factor coefficients used to calculate
the scattering factors for this atom type.
Ref: International Tables for X-ray Crystallography (1974).
Vol. IV, Table 2.2B
or International Tables for Crystallography (2004). Vol. C,
Tables 6.1.1.4 and 6.1.1.5
Appears in list containing _atom_type_symbol
Type: numb
Category: atom_type
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