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Xm=Ng^2NB^2/3kT*1/2*3/2*(1+u1+u2+u1*u2)/(1-u1*u2
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u1=coth(j1/kT)-kT/j1;
u2=coth(j2/kT)-kT/j2;

reference: Roberto CorteÂs,²,³  Marc Drillon,¡ì  Xavier Solans,¡Í  Luis Lezama,²  and TeoÂfilo Rojo*, Inorganic Chemistry, Vol. 36, No. 4, 1997   681
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coth(x)=cosh(x)/sinh(x)
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