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Exponential attenuation

I = 74.08 a.u.

I=I0exp⁡[−(μ/ρ) ρx]I = I_0 \exp\left[-(\mu/\rho)\,\rho x\right]

Narrow-beam transmission: I = I₀ e^{−(μ/ρ) ρ x}.

Laser