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Fig. 19

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Top: |Δτ| (Eq. (9)) versus AV (left) and τint∫ τdv (right) for the central+off-axis subset, with the horizontal dashed line showing the median value. Note that AV and τint are measured toward pointing centers. Also shown are median and maximum of |Δτ| per pointing, and median |Δτ| in equal frequency bins. The 1σ uncertainty on averaged |Δτ| per bin is too small and not shown. For clarity, one measurement with |Δτ| = 2.53 is omitted from the plot. Bottom: |Δτrel| (Eq. (10)) versus AV (left) and τint∫ τdv (right). For clarity, one measurement with |Δτrel| = 1.66 is omitted from the plot. The remaining details are same as top panels.

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