Scatter plots of the maximum radius Rmax (black points) and of the mean radius Rm (red points) vs. the number of photons in the clusters for all the 9Y-MST sources. We note that for high photon number the mean radius is very close the constant value of 4ʹ̣5 (horizontal line). Green crosses overlaid on the black points indicate the 3FGL counterparts to the 9Y-MST clusters.
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