Δ(α) as a function of x at various z-positions (…_exp) together with Gaussian fits (..._fit). Set_Figure8a_exp, Set_Figure8a_fit: z = 3 mm; Set_Figure8b_exp, Set_Figure8b_fit: z = 4 mm; Set_Figure8c_exp, Set_Figure8c_fit: z = 6 mm; Set_Figure8d_exp, Set_Figure8d_fit: z = 8 mm; Set_Figure8e_exp, Set_Figure8e_fit: z = 10 mm - see Fig 8 in the publication.

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