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<math>
 
<math>
 
\sigma_{fit}^2=
 
\sigma_{fit}^2=
\left| \sum_k^n{ \sigma_{u_k}
+
\left( \sum_k^n{ \sigma_{u_k}
  \frac{\partial}{\partial u_k}\left(
  −
    \sum_{\alpha,\beta}^n{u_\alpha u_\beta^* I_{\alpha\beta}}
  −
  \right)
  −
}
  −
\right|^2
  −
</math>
  −
::<math>
  −
=\left( \sum_k^n{ \sigma_{u_k}
   
   \sum_{\gamma,\delta}{ \rho_{\gamma\delta}
 
   \sum_{\gamma,\delta}{ \rho_{\gamma\delta}
 
     \sum_{\alpha,\beta}^n{\delta_{k\alpha} u_\beta^* J^{\gamma\delta}_{\alpha\beta}}
 
     \sum_{\alpha,\beta}^n{\delta_{k\alpha} u_\beta^* J^{\gamma\delta}_{\alpha\beta}}

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