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temp1=J/1.38/10^23
temp2=exp(2*temp1/T)+5*exp(6*temp1/T)+14*exp(12*temp1/T)
temp3=1+3*exp(2*temp1/T)+5*exp(6*temp1/T)+7*exp(12*temp1/T)
XmT=0.75*g^2*temp2/temp3
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