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% Physical constants.
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c0 =299792458;																	%speed of light
u0 =4*pi*1e-7;																	%permeability
E0 =1/(c0^2*u0);																%permittivity
hP =6.6260755e-34/2/pi;			hbar=hP;										%Plancks constant
kB =1.3806e-23;																	%Boltzmanns constant
aB =.529e-10;																	%Bohrs radius				4*pi*E0*hP^2/e^2/mE
uB =9.2741e-24;																	%Bohrs magneton
uK =5.0501e-27;																	%nuclear magneton
gG =9.81;																		%gravitational acceleration
gN =6.672e-11;																	%gravitational constant
uA =1.6605e-27;																	%atomic mass		
e0 =1.60217733e-19;																%electron charge
mE =9.1e-31;																	%electron mass
aFS=1/137;																		%fine structure constant
g2 =2+aFS/pi;																	%electron g factor
aU =e0^2/4/pi/E0/aB;															%atomic units