Parameterization of the measured values to the semilogarithmic Gaussian distribution function for each of the two absorption bands:

σ(λ) = {σ_max × exp(-W[ln(λ_max/λ)]²)}_first + {σ_max × exp(-W[ln(λ_max/λ)]²)}_second

with
σ_max = (3.99 ± 0.33)×10^-19 cm² molecule^-1, W = 174.4 ± 5.8, λ_max = (338.4 ± 0.2) nm for band 1, and

σ_max = (2.85 ± 0.22)×10^-19 cm² molecule^-1, W = 196.0 ± 5.8, λ_max = (404.8 ± 0.2) nm for band 2