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boost::units::si::constants::codata::BOOST_UNITS_PHYSICAL_CONSTANT — CODATA recommended values of the fundamental physical constants: NIST SP 961.
// In header: <boost/units/systems/si/codata/neutron_constants.hpp> BOOST_UNITS_PHYSICAL_CONSTANT(m_n, quantity< mass >, 1.674927211e-27 * kilograms, 8.4e-35 * kilograms);