Distribution of the ratio of detection power metrics (DP, see text for definition) for quarters 0 through 3 (quarters 4, 5 and 6 are very similar to Q1 and Q2). The anomalously short Q0 is exceptionally underperforming but there too SARS has higher DP than PDC for ~3/4 of the data. For the sake of clarity we present only the range between 2/3 and 1.5 (representing a performance difference of 50% in each direction).