Compute the data and draw a curve of ag/Q versus depth for points directly below a point load Q. On the same plot draw curves of a,/Q versus depth for points directly below the center of square footings with breadths of 5 m and 15 rn, respectively, each carrying a uniformly distributed load Q. On the basis of this plot, make a statement relative to the range within which loaded areas may be considered to act as point loads. (After Taylor, 1948.)