The Planck equation
$ L_\lambda(\lambda,T) = \epsilon_\lambda \cdot c_{1L} / \left( n_\lambda^2 \cdot \lambda^5 \cdot \left[\exp \left\{ c_2 / \left( n_\lambda \cdot \lambda \cdot T\right) \right\} - 1\right] \right) \left[ {\rm W} \cdot {\rm cm}^{-3} \cdot {\rm sr}^{-1}\right] $
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