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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/electromagnetic_constants.hpp> BOOST_UNITS_PHYSICAL_CONSTANT(e, quantity< electric_charge >, 1.602176487e-19 * coulombs, 4.0e-27 * coulombs);