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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/triton_constants.hpp>
BOOST_UNITS_PHYSICAL_CONSTANT(m_t, quantity< mass >,
5.00735588e-27 * kilograms,
2.5e-34 * kilograms);