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Fig. 6

image

Normalized likelihood L as a functionof the intrinsic spread s0 of the distributions of Stokes parameters for DP2 (left panel) and DP3 (right panel). A vertical line shows the maximum likelihood s0. The 99% confidence intervals for DP2 and DP3 are s0 ≤ 0.187% and s0 ≤ 0.127%, respectively.

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