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t0 (SI unit: s) is the previous time step, reflection time, or refraction time,
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λ0 (SI unit: m) is the free-space wavelength of the radiation,
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N − iK (dimensionless) is the apparent refractive index of the medium, where N and K are real numbers, and
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t0 (SI unit: s) is the previous time step, reflection time, or refraction time,
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Vg (SI unit: m/s) is the group velocity magnitude,
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