Table 3. Atoms Tier.

Column name	PostgreSQL variable type	Unit	Key status
ens_id	INTEGER	N/A	Foreign
atom_id	BIGINT	N/A	Primary
atom_seq	INTEGER	N/A	None
sys_seq	INTEGER	N/A	None
atom_name	CHAR(5)	N/A	None
resid_seq	INTEGER	N/A	None
resid_name	CHAR(4)	N/A	None
chain_seq	CHAR(2)	N/A	None
keyword	CHAR(6)	N/A	None
occupancy	DOUBLE PRECISION	Fraction	None
tempfactor	DOUBLE PRECISION	N/A	None
biotype	INTEGER	N/A	None
molecule_id	INTEGER	N/A	None
mass	DOUBLE PRECISION	a.m.u.	None
partial_charge	DOUBLE PRECISION	e	None
formal_charge	SMALLINT	e	None
charge_group_id	INTEGER	N/A	None
rfos_contribution	DOUBLE PRECISION	kcal/mol	None
solvation_group_id	INTEGER	N/A	None
bound_partners	INTEGER[5]	N/A	None
zmatrix_references	INTEGER[4]	N/A	None
zmatrix_values	DOUBLE PRECISION[3]	Å and °	None