Fig. 2
Five series of eigenvalues of Eq. (8) for optical depths τ0 = 5,10,20,40,70. Filled dots: 64 eigenvalues for τ0 = 5. Filled squares: same set of eigenvalues for τ0 = 10. Filled rhombuses: same set of eigenvalues for τ0 = 20. Filled up triangles: τ0 = 40. Filled down triangles: τ0 = 70.
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