Table 1: Fit results of our NPOI data to models of a uniform disc (UD) and a fully darkened (FDD) disc. The formal errors of the diameter values are $\sim $0.01 mas, additional calibration uncertainties are $\sim $0.06 mas, total errors thus $\sim $0.06 mas.
Model Diameter Parameter $\alpha$ $\chi^2_\nu$
UD $\Theta_{\rm UD}=5.64$ mas $\alpha=0$ 11.0
FDD $\Theta_{\rm FDD}=6.59$ mas $\alpha=1$ 5.6

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