The number of target concepts for which some attributes are extracted is 12 for run N, 23 for Y, 17 for E s and 23 for E a .
both run N and run E s exhibit rather binary behavior across individual classes, in that they tend to either not retrieve any attributes or retrieve attributes of relatively higher quality than the other runs, causing E s and N to have the worst precision scores in the last but one row of Table 5, but the best precision scores in the last row of Table 5.