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h is the Planck constant (SI unit: J·s)
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kB is the Boltzmann constant (SI unit: J/K)
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c0 is the speed of the light in vacuum (SI unit: m/s)
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λ is the wavelength in vacuum (SI unit: m)
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n is the refractive index of the media (SI unit: 1), equal to 1 in vacuum
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The function eb(T) is available as a predefined function via ht.feb(T) in the Heat Transfer interfaces.
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