Left: distribution of the thermal source volumes obtained with the direct and indirect methods, Vdir (top) and Vind (bottom), as derived from the optimum imaging algorithms individually selected for each event. Dashed lines indicate the median of the distributions. Also given is the number of measurements N. Right: comparison of Vdir and Vind. Only cotemporal measurements are included. Error bars show the standard deviation from the different imaging methods. Also shown is a power-law fit (dashed line, with slope α), the rank correlation coefficient R, and the number of value pairs N. The dotted line denotes x = y. At the bottom of the plot, the mean ratio ⟨ Vdir/Vind ⟩ is shown.
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