The Planck equation
$ T\left( \lambda,L_\lambda\right) = c_2 / \left( n_\lambda \cdot \lambda\cdot \log \left[ \epsilon_\lambda \cdot c_{1L} / \left( n_\lambda^2 \cdot \lambda^5 \cdot L_\lambda \right) + 1\right]\right) [{\rm K}] $
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