Fig. 3
Comparison between the first eigenvalues of the space operator ℒτ defined in Eq. (12) obtained with different methods as a function of the optical depth τ0 of the slab. Filled circles: Atkinson-Shampine method (Sect. 4). Filled squares: variational approach by L88 (see Eq. (36)). Filled rhombuses: asymptotic limit as defined in Eq. (35).
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