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Fig. C.1

image

Histogram shape parameter, ξ, as a function of log 10(NH/ cm-2) in the Taurus region. Blue lines join the ξ values obtained using the τ353 map at 10 resolution and each of 1000 random realizations of Q and U maps corresponding to a uniform distribution of ψ. Results in black and grey are from the analysis of the Planck data, as reported in Fig. 7.

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