By looking at the pdf plots and the minimum and maximum columns from Table 2, we notice that for  1   0  5  10  15  20  25  30  35  40  45  50 "Legal-50-Ensemble-ROUGE-1.dat"  all the domains, the pdfs are long-tailed distributions.
comparing Table 2 with the values in Table 1, we also notice that the compression ratio affects the performance differently for each domain.