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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/electron_constants.hpp> BOOST_UNITS_PHYSICAL_CONSTANT(m_e, quantity< mass >, 9.10938215e-31 * kilograms, 4.5e-38 * kilograms);