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Recently, Duvall and Hanasoge ({\it Solar Phys.} {\bf 287}, 71-83, 2013)found that large distance $[\Delta]$ separation travel-time differences from acenter to an annulus $[\delta t_{\rm{oi}}]$ implied a model of the averagesupergranular cell that has a peak upflow of $240\rm{ms^{-1}}$ at a depth of$2.3\rm{Mm}$ and a corresponding peak outward horizontal flow of$700\rm{ms^{-1}}$ at a depth of $1.6\rm{Mm}$. In the present work, this effectis further studied by measuring and modeling center-to-quadrant travel-timedifferences $[\delta t_{\rm{qu}}]$, which roughly agree with this model.Simulations are analyzed that show that such a model flow would lead to theexpected travel-time differences. As a check for possible systematic errors,the center-to-annulus travel-time differences $[\delta t_{\rm{oi}}]$ are foundnot to vary with heliocentric angle. A consistency check finds an increase of$\delta t_{\rm{oi}}$ with the temporal frequency $[\nu]$ by a factor of two,which is not predicted by the ray theory.

Additional Evidence Supporting a Model of Shallow, High-Speed Supergranulation