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+// Boost.Units - A C++ library for zero-overhead dimensional analysis and
+// unit/quantity manipulation and conversion
+//
+// Copyright (C) 2003-2008 Matthias Christian Schabel
+// Copyright (C) 2008 Steven Watanabe
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UNITS_CODATA_TAU_CONSTANTS_HPP
+#define BOOST_UNITS_CODATA_TAU_CONSTANTS_HPP
+
+#include <boost/units/static_constant.hpp>
+
+#include <boost/units/systems/detail/constants.hpp>
+#include <boost/units/systems/si/amount.hpp>
+#include <boost/units/systems/si/area.hpp>
+#include <boost/units/systems/si/electric_charge.hpp>
+#include <boost/units/systems/si/energy.hpp>
+#include <boost/units/systems/si/frequency.hpp>
+#include <boost/units/systems/si/length.hpp>
+#include <boost/units/systems/si/mass.hpp>
+#include <boost/units/systems/si/magnetic_flux_density.hpp>
+#include <boost/units/systems/si/time.hpp>
+#include <boost/units/systems/si/wavenumber.hpp>
+
+#include <boost/units/systems/si/codata/typedefs.hpp>
+
+/// \file
+/// CODATA recommended values of fundamental atomic and nuclear constants
+/// CODATA 2006 values as of 2007/03/30
+
+namespace boost {
+
+namespace units {
+
+namespace si {
+
+namespace constants {
+
+namespace codata {
+
+/// CODATA recommended values of the fundamental physical constants: NIST SP 961
+
+/// tau mass
+BOOST_UNITS_PHYSICAL_CONSTANT(m_tau,quantity<mass>,3.16777e-27*kilograms,5.2e-31*kilograms);
+/// tau-electron mass ratio
+BOOST_UNITS_PHYSICAL_CONSTANT(m_tau_over_m_e,quantity<dimensionless>,3477.48*dimensionless(),5.7e-1*dimensionless());
+/// tau-muon mass ratio
+BOOST_UNITS_PHYSICAL_CONSTANT(m_tau_over_m_mu,quantity<dimensionless>,16.8183*dimensionless(),2.7e-3*dimensionless());
+/// tau-proton mass ratio
+BOOST_UNITS_PHYSICAL_CONSTANT(m_tau_over_m_p,quantity<dimensionless>,1.89390*dimensionless(),3.1e-4*dimensionless());
+/// tau-neutron mass ratio
+BOOST_UNITS_PHYSICAL_CONSTANT(m_tau_over_m_n,quantity<dimensionless>,1.89129*dimensionless(),3.1e-4*dimensionless());
+/// tau molar mass
+BOOST_UNITS_PHYSICAL_CONSTANT(M_tau,quantity<mass_over_amount>,1.90768e-3*kilograms/mole,3.1e-7*kilograms/mole);
+/// tau Compton wavelength
+BOOST_UNITS_PHYSICAL_CONSTANT(lambda_C_tau,quantity<length>,0.69772e-15*meters,1.1e-19*meters);
+
+} // namespace codata
+
+} // namespace constants
+
+} // namespace si
+
+} // namespace units
+
+} // namespace boost
+
+#endif // BOOST_UNITS_CODATA_TAU_CONSTANTS_HPP