Fig. 11

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Values of the radial profile indexes of vertical optical depth (τ) derived from the n and σ fits displayed in Table 1, when making the simplifying assumption that the radial dependence of τ is the same as that of σ, or is equal to that of n plus one (constant opening angle). The blue domain corresponds to the range of τ(r) indexes between the −1.48 value obtained for our nominal case and the −1.21 value for our bright disc (fd = 4 × 10−3) case (see Fig. 1).
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