ored format. ylo = the lower end of the interval is the first (left) column in the pair.  yhi is the upper end of the interval, at the second (right) column in the pair. For a detected value, ylo=yhi.  For a ND,  ylo != yhi. The uscore is the number of observations known to be lower minus the number of observations known to be higher. Ties, including those such as &lt;1 vs &lt;3 or 4 vs 4 or &lt;3 vs 2, are given a 0 value in the uscore computation. The ranks of uscores provides a scale that is often more m