Macromolecular dictionary (mmCIF) version 2.0.09
The mean hydrostatic pressure in kilopascals below which the intensities were measured. _diffrn.ambient_pressure_gt and _diffrn.ambient_pressure_lt allow a pressure range to be given. _diffrn.ambient_pressure should always be used in preference to these two items whenever possible.
Mandatory item: noAlias:
_diffrn_ambient_pressure_lt (cif_core.dic version 2.3)
The permitted range is [0.0, infinity)
Related item: _diffrn.ambient_pressure (alternate)