Example of the ambiguity implicit within our algorithm. Any density peak or nonmonotonic behavior of the field over scales smaller than our resolution ϵ will not be detected. Here we exhibit two distinct cases of a density field: in both, the four vertices at which we measure ﹩{\delta }_{{ij}}﹩ are “out” of the excursion region, but in the right panel, there is a maxima internal to the square. Our algorithm can never detect such small-scale features and will always select the left case in this example.