檢視 $N r, N i, alpha 的原始碼

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 $N r, N i, alpha // float, float, float

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Optical properties for shell material.
N_r and N_i are real part and imaginary part of refraction index, respectively. alpha is the absorption coefficient. <br>

The 1st line is the data for outer space, the 2nd line is the data for 1st shell, the 3rd line is the data for 2nd shell, etc. <br>
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